TOR(1) Manual Page

Display a short help message and exit.

FILE contains further "option value" pairs. (Default: /etc/tor/torrc)

Generates a hashed password for control port access.

Generate your keys and output your nickname and fingerprint.

Verify the configuration file is valid.

--service [install|remove|start|stop] Manage the Tor Windows NT/2000/XP service. Current instructions can be found at https://wiki.torproject.org/noreply/TheOnionRouter/TorFAQ#WinNTService

List all valid options.

Display Tor version and exit.

Do not start Tor with a console log unless explicitly requested to do so. (By default, Tor starts out logging messages at level "notice" or higher to the console, until it has parsed its configuration.)

A token bucket limits the average incoming bandwidth usage on this node to the specified number of bytes per second, and the average outgoing bandwidth usage to that same value. If you want to run a relay in the public network, this needs to be at the very least 20 KB (that is, 20480 bytes). (Default: 5 MB)

Limit the maximum token bucket size (also known as the burst) to the given number of bytes in each direction. (Default: 10 MB)

If set, we will not advertise more than this amount of bandwidth for our BandwidthRate. Server operators who want to reduce the number of clients who ask to build circuits through them (since this is proportional to advertised bandwidth rate) can thus reduce the CPU demands on their server without impacting network performance.

If not 0, a separate token bucket limits the average incoming bandwidth usage for _relayed traffic_ on this node to the specified number of bytes per second, and the average outgoing bandwidth usage to that same value. Relayed traffic currently is calculated to include answers to directory requests, but that may change in future versions. (Default: 0)

If not 0, limit the maximum token bucket size (also known as the burst) for _relayed traffic_ to the given number of bytes in each direction. (Default: 0)

If set, do separate rate limiting for each connection from a non-relay. You should never need to change this value, since a network-wide value is published in the consensus and your relay will use that value. (Default: 0)

If set, do separate rate limiting for each connection from a non-relay. You should never need to change this value, since a network-wide value is published in the consensus and your relay will use that value. (Default: 0)

The minimum number of file descriptors that must be available to the Tor process before it will start. Tor will ask the OS for as many file descriptors as the OS will allow (you can find this by "ulimit -H -n"). If this number is less than ConnLimit, then Tor will refuse to start.

You probably don’t need to adjust this. It has no effect on Windows since that platform lacks getrlimit(). (Default: 1000)

If set, Tor will tell the kernel to attempt to shrink the buffers for all sockets to the size specified in ConstrainedSockSize. This is useful for virtual servers and other environments where system level TCP buffers may be limited. If you’re on a virtual server, and you encounter the "Error creating network socket: No buffer space available" message, you are likely experiencing this problem.

The preferred solution is to have the admin increase the buffer pool for the host itself via /proc/sys/net/ipv4/tcp_mem or equivalent facility; this configuration option is a second-resort.

The DirPort option should also not be used if TCP buffers are scarce. The cached directory requests consume additional sockets which exacerbates the problem.

You should not enable this feature unless you encounter the "no buffer space available" issue. Reducing the TCP buffers affects window size for the TCP stream and will reduce throughput in proportion to round trip time on long paths. (Default: 0.)

When ConstrainedSockets is enabled the receive and transmit buffers for all sockets will be set to this limit. Must be a value between 2048 and 262144, in 1024 byte increments. Default of 8192 is recommended.

If set, Tor will accept connections on this port and allow those connections to control the Tor process using the Tor Control Protocol (described in control-spec.txt). Note: unless you also specify one or more of HashedControlPassword or CookieAuthentication, setting this option will cause Tor to allow any process on the local host to control it. (Setting both authentication methods means either method is sufficient to authenticate to Tor.) This option is required for many Tor controllers; most use the value of 9051. Set it to "auto" to have Tor pick a port for you. (Default: 0).

Bind the controller listener to this address. If you specify a port, bind to this port rather than the one specified in ControlPort. We strongly recommend that you leave this alone unless you know what you’re doing, since giving attackers access to your control listener is really dangerous. (Default: 127.0.0.1) This directive can be specified multiple times to bind to multiple addresses/ports.

Like ControlPort, but listens on a Unix domain socket, rather than a TCP socket. (Unix and Unix-like systems only.)

If this option is set to 0, don’t allow the filesystem group to read and write unix sockets (e.g. ControlSocket). If the option is set to 1, make the control socket readable and writable by the default GID. (Default: 0)

Allow connections on the control port if they present the password whose one-way hash is hashed_password. You can compute the hash of a password by running "tor --hash-password password". You can provide several acceptable passwords by using more than one HashedControlPassword line.

If this option is set to 1, allow connections on the control port when the connecting process knows the contents of a file named "control_auth_cookie", which Tor will create in its data directory. This authentication method should only be used on systems with good filesystem security. (Default: 0)

If set, this option overrides the default location and file name for Tor’s cookie file. (See CookieAuthentication above.)

If this option is set to 0, don’t allow the filesystem group to read the cookie file. If the option is set to 1, make the cookie file readable by the default GID. [Making the file readable by other groups is not yet implemented; let us know if you need this for some reason.] (Default: 0).

If set, Tor writes the address and port of any control port it opens to this address. Usable by controllers to learn the actual control port when ControlPort is set to "auto".

If this option is set to 0, don’t allow the filesystem group to read the control port file. If the option is set to 1, make the control port file readable by the default GID. (Default: 0).

Store working data in DIR (Default: /var/lib/tor)

Use a nonstandard authoritative directory server at the provided address and port, with the specified key fingerprint. This option can be repeated many times, for multiple authoritative directory servers. Flags are separated by spaces, and determine what kind of an authority this directory is. By default, every authority is authoritative for current ("v2")-style directories, unless the "no-v2" flag is given. If the "v1" flags is provided, Tor will use this server as an authority for old-style (v1) directories as well. (Only directory mirrors care about this.) Tor will use this server as an authority for hidden service information if the "hs" flag is set, or if the "v1" flag is set and the "no-hs" flag is not set. Tor will use this authority as a bridge authoritative directory if the "bridge" flag is set. If a flag "orport=port" is given, Tor will use the given port when opening encrypted tunnels to the dirserver. Lastly, if a flag "v3ident=fp" is given, the dirserver is a v3 directory authority whose v3 long-term signing key has the fingerprint fp.

If no dirserver line is given, Tor will use the default directory servers. NOTE: this option is intended for setting up a private Tor network with its own directory authorities. If you use it, you will be distinguishable from other users, because you won’t believe the same authorities they do.

As DirServer, but replaces less of the default directory authorities. Using AlternateDirAuthority replaces the default Tor directory authorities, but leaves the hidden service authorities and bridge authorities in place. Similarly, Using AlternateHSAuthority replaces the default hidden service authorities, but not the directory or bridge authorities.

If set to 1, Tor will attempt to lock all current and future memory pages, so that memory cannot be paged out. Windows, OS X and Solaris are currently not supported. We believe that this feature works on modern Gnu/Linux distributions, and that it should work on *BSD systems (untested). This option requires that you start your Tor as root, and you should use the User option to properly reduce Tor’s privileges. (Default: 0)

If set to 1, Tor will always fetch directory information like other directory caches, even if you don’t meet the normal criteria for fetching early. Normal users should leave it off. (Default: 0)

If set to 1, Tor will fetch directory information before other directory caches. It will attempt to download directory information closer to the start of the consensus period. Normal users should leave it off. (Default: 0)

If set to 0, Tor will never fetch any hidden service descriptors from the rendezvous directories. This option is only useful if you’re using a Tor controller that handles hidden service fetches for you. (Default: 1)

If set to 0, Tor will never fetch any network status summaries or server descriptors from the directory servers. This option is only useful if you’re using a Tor controller that handles directory fetches for you. (Default: 1)

If set to 1, Tor will fetch every non-obsolete descriptor from the authorities that it hears about. Otherwise, it will avoid fetching useless descriptors, for example for routers that are not running. This option is useful if you’re using the contributed "exitlist" script to enumerate Tor nodes that exit to certain addresses. (Default: 0)

Tor will make all its directory requests through this host:port (or host:80 if port is not specified), rather than connecting directly to any directory servers.

If defined, Tor will use this username:password for Basic HTTP proxy authentication, as in RFC 2617. This is currently the only form of HTTP proxy authentication that Tor supports; feel free to submit a patch if you want it to support others.

Tor will make all its OR (SSL) connections through this host:port (or host:443 if port is not specified), via HTTP CONNECT rather than connecting directly to servers. You may want to set FascistFirewall to restrict the set of ports you might try to connect to, if your HTTPS proxy only allows connecting to certain ports.

If defined, Tor will use this username:password for Basic HTTPS proxy authentication, as in RFC 2617. This is currently the only form of HTTPS proxy authentication that Tor supports; feel free to submit a patch if you want it to support others.

Tor will make all OR connections through the SOCKS 4 proxy at host:port (or host:1080 if port is not specified).

Tor will make all OR connections through the SOCKS 5 proxy at host:port (or host:1080 if port is not specified).

If defined, authenticate to the SOCKS 5 server using username and password in accordance to RFC 1929. Both username and password must be between 1 and 255 characters.

To keep firewalls from expiring connections, send a padding keepalive cell every NUM seconds on open connections that are in use. If the connection has no open circuits, it will instead be closed after NUM seconds of idleness. (Default: 5 minutes)

Send all messages between minSeverity and maxSeverity to the standard output stream, the standard error stream, or to the system log. (The "syslog" value is only supported on Unix.) Recognized severity levels are debug, info, notice, warn, and err. We advise using "notice" in most cases, since anything more verbose may provide sensitive information to an attacker who obtains the logs. If only one severity level is given, all messages of that level or higher will be sent to the listed destination.

As above, but send log messages to the listed filename. The "Log" option may appear more than once in a configuration file. Messages are sent to all the logs that match their severity level.

As above, but select messages by range of log severity and by a set of "logging domains". Each logging domain corresponds to an area of functionality inside Tor. You can specify any number of severity ranges for a single log statement, each of them prefixed by a comma-separated list of logging domains. You can prefix a domain with ~ to indicate negation, and use * to indicate "all domains". If you specify a severity range without a list of domains, it matches all domains.

This is an advanced feature which is most useful for debugging one or two of Tor’s subsystems at a time.

The currently recognized domains are: general, crypto, net, config, fs, protocol, mm, http, app, control, circ, rend, bug, dir, dirserv, or, edge, acct, hist, and handshake. Domain names are case-insensitive.

For example, "Log [handshake]debug [~net,~mm]info notice stdout" sends to stdout: all handshake messages of any severity, all info-and-higher messages from domains other than networking and memory management, and all messages of severity notice or higher.

If 1, Tor includes message domains with each log message. Every log message currently has at least one domain; most currently have exactly one. This doesn’t affect controller log messages. (Default: 0)

Make all outbound connections originate from the IP address specified. This is only useful when you have multiple network interfaces, and you want all of Tor’s outgoing connections to use a single one. This setting will be ignored for connections to the loopback addresses (127.0.0.0/8 and ::1).

On startup, write our PID to FILE. On clean shutdown, remove FILE.

If 1, Tor will log with severity 'warn' various cases of other parties not following the Tor specification. Otherwise, they are logged with severity 'info'. (Default: 0)

If 1, Tor forks and daemonizes to the background. This option has no effect on Windows; instead you should use the --service command-line option. (Default: 0)

Tor can scrub potentially sensitive strings from log messages (e.g. addresses) by replacing them with the string [scrubbed]. This way logs can still be useful, but they don’t leave behind personally identifying information about what sites a user might have visited.

If this option is set to 0, Tor will not perform any scrubbing, if it is set to 1, all potentially sensitive strings are replaced. If it is set to relay, all log messages generated when acting as a relay are sanitized, but all messages generated when acting as a client are not. (Default: 1)

On startup, setuid to this user and setgid to their primary group.

If non-zero, try to use built-in (static) crypto hardware acceleration when available. (Default: 0)

When using OpenSSL hardware crypto acceleration attempt to load the dynamic engine of this name. This must be used for any dynamic hardware engine. Names can be verified with the openssl engine command.

Specify this option if using dynamic hardware acceleration and the engine implementation library resides somewhere other than the OpenSSL default.

If non-zero, try to write to disk less frequently than we would otherwise. This is useful when running on flash memory or other media that support only a limited number of writes. (Default: 0)

If non-zero, when a directory server we contact supports it, we will build a one-hop circuit and make an encrypted connection via its ORPort. (Default: 1)

If non-zero, we will avoid directory servers that don’t support tunneled directory connections, when possible. (Default: 1)

If this value is set, we override the default algorithm for choosing which circuit’s cell to deliver or relay next. When the value is 0, we round-robin between the active circuits on a connection, delivering one cell from each in turn. When the value is positive, we prefer delivering cells from whichever connection has the lowest weighted cell count, where cells are weighted exponentially according to the supplied CircuitPriorityHalflife value (in seconds). If this option is not set at all, we use the behavior recommended in the current consensus networkstatus. This is an advanced option; you generally shouldn’t have to mess with it. (Default: not set.)

If some Tor servers are obviously not working right, the directory authorities can manually mark them as invalid, meaning that it’s not recommended you use them for entry or exit positions in your circuits. You can opt to use them in some circuit positions, though. The default is "middle,rendezvous", and other choices are not advised.

This option controls whether circuits built by Tor will include relays with the AllowSingleHopExits flag set to true. If ExcludeSingleHopRelays is set to 0, these relays will be included. Note that these relays might be at higher risk of being seized or observed, so they are not normally included. Also note that relatively few clients turn off this option, so using these relays might make your client stand out. (Default: 1)

When set along with UseBridges, instructs Tor to use the relay at "IP:ORPort" as a "bridge" relaying into the Tor network. If "fingerprint" is provided (using the same format as for DirServer), we will verify that the relay running at that location has the right fingerprint. We also use fingerprint to look up the bridge descriptor at the bridge authority, if it’s provided and if UpdateBridgesFromAuthority is set too.

If 0, CircuitBuildTimeout adaptive learning is disabled. (Default: 1)

Try for at most NUM seconds when building circuits. If the circuit isn’t open in that time, give up on it. If LearnCircuitBuildTimeout is 1, this value serves as the initial value to use before a timeout is learned. If LearnCircuitBuildTimeout is 0, this value is the only value used. (Default: 60 seconds.)

If we have kept a clean (never used) circuit around for NUM seconds, then close it. This way when the Tor client is entirely idle, it can expire all of its circuits, and then expire its TLS connections. Also, if we end up making a circuit that is not useful for exiting any of the requests we’re receiving, it won’t forever take up a slot in the circuit list. (Default: 1 hour.)

If non-zero, this option overrides our internal timeout schedule for how many seconds until we detach a stream from a circuit and try a new circuit. If your network is particularly slow, you might want to set this to a number like 60. (Default: 0)

If set to 1, Tor will under no circumstances run as a relay or serve directory requests. This config option is mostly meaningless: we added it back when we were considering having Tor clients auto-promote themselves to being relays if they were stable and fast enough. The current behavior is simply that Tor is a client unless ORPort or DirPort are configured. (Default: 0)

A list of identity fingerprints, nicknames, country codes and address patterns of nodes to avoid when building a circuit. (Example: ExcludeNodes SlowServer, ABCD1234CDEF5678ABCD1234CDEF5678ABCD1234, {cc}, 255.254.0.0/8)

By default, this option is treated as a preference that Tor is allowed to override in order to keep working. For example, if you try to connect to a hidden service, but you have excluded all of the hidden service’s introduction points, Tor will connect to one of them anyway. If you do not want this behavior, set the StrictNodes option (documented below).

Note also that if you are a relay, this (and the other node selection options below) only affects your own circuits that Tor builds for you. Clients can still build circuits through you to any node. Controllers can tell Tor to build circuits through any node.

A list of identity fingerprints, nicknames, country codes and address patterns of nodes to never use when picking an exit node---that is, a node that delivers traffic for you outside the Tor network. Note that any node listed in ExcludeNodes is automatically considered to be part of this list too. See also the caveats on the "ExitNodes" option below.

A list of identity fingerprints, nicknames, country codes and address patterns of nodes to use as exit node---that is, a node that delivers traffic for you outside the Tor network.

Note that if you list too few nodes here, or if you exclude too many exit nodes with ExcludeExitNodes, you can degrade functionality. For example, if none of the exits you list allows traffic on port 80 or 443, you won’t be able to browse the web.

Note also that not every circuit is used to deliver traffic outside of the Tor network. It is normal to see non-exit circuits (such as those used to connect to hidden services, those that do directory fetches, those used for relay reachability self-tests, and so on) that end at a non-exit node. To keep a node from being used entirely, see ExcludeNodes and StrictNodes.

The ExcludeNodes option overrides this option: any node listed in both ExitNodes and ExcludeNodes is treated as excluded.

The .exit address notation, if enabled via AllowDotExit, overrides this option.

A list of identity fingerprints and nicknames of nodes to use for the first hop in your normal circuits. (Country codes and address patterns are not yet supported.) Normal circuits include all circuits except for direct connections to directory servers. The Bridge option overrides this option; if you have configured bridges and UseBridges is 1, the Bridges are used as your entry nodes.

The ExcludeNodes option overrides this option: any node listed in both EntryNodes and ExcludeNodes is treated as excluded.

If StrictNodes is set to 1, Tor will treat the ExcludeNodes option as a requirement to follow for all the circuits you generate, even if doing so will break functionality for you. If StrictNodes is set to 0, Tor will still try to avoid nodes in the ExcludeNodes list, but it will err on the side of avoiding unexpected errors. Specifically, StrictNodes 0 tells Tor that it is okay to use an excluded node when it is necessary to perform relay reachability self-tests, connect to a hidden service, provide a hidden service to a client, fulfill a .exit request, upload directory information, or download directory information. (Default: 0)

If 1, Tor will only create outgoing connections to ORs running on ports that your firewall allows (defaults to 80 and 443; see FirewallPorts). This will allow you to run Tor as a client behind a firewall with restrictive policies, but will not allow you to run as a server behind such a firewall. If you prefer more fine-grained control, use ReachableAddresses instead.

A list of ports that your firewall allows you to connect to. Only used when FascistFirewall is set. This option is deprecated; use ReachableAddresses instead. (Default: 80, 443)

Client authorization for a hidden service. Valid onion addresses contain 16 characters in a-z2-7 plus ".onion", and valid auth cookies contain 22 characters in A-Za-z0-9+/. The service name is only used for internal purposes, e.g., for Tor controllers. This option may be used multiple times for different hidden services. If a hidden service uses authorization and this option is not set, the hidden service is not accessible. Hidden services can be configured to require authorization using the HiddenServiceAuthorizeClient option.

A comma-separated list of IP addresses and ports that your firewall allows you to connect to. The format is as for the addresses in ExitPolicy, except that "accept" is understood unless "reject" is explicitly provided. For example, 'ReachableAddresses 99.0.0.0/8, reject 18.0.0.0/8:80, accept *:80' means that your firewall allows connections to everything inside net 99, rejects port 80 connections to net 18, and accepts connections to port 80 otherwise. (Default: 'accept *:*'.)

Like ReachableAddresses, a list of addresses and ports. Tor will obey these restrictions when fetching directory information, using standard HTTP GET requests. If not set explicitly then the value of ReachableAddresses is used. If HTTPProxy is set then these connections will go through that proxy.

Like ReachableAddresses, a list of addresses and ports. Tor will obey these restrictions when connecting to Onion Routers, using TLS/SSL. If not set explicitly then the value of ReachableAddresses is used. If HTTPSProxy is set then these connections will go through that proxy.

The separation between ReachableORAddresses and ReachableDirAddresses is only interesting when you are connecting through proxies (see HTTPProxy and HTTPSProxy). Most proxies limit TLS connections (which Tor uses to connect to Onion Routers) to port 443, and some limit HTTP GET requests (which Tor uses for fetching directory information) to port 80.

A list of ports for services that tend to have long-running connections (e.g. chat and interactive shells). Circuits for streams that use these ports will contain only high-uptime nodes, to reduce the chance that a node will go down before the stream is finished. (Default: 21, 22, 706, 1863, 5050, 5190, 5222, 5223, 6667, 6697, 8300)

When a request for address arrives to Tor, it will rewrite it to newaddress before processing it. For example, if you always want connections to www.indymedia.org to exit via torserver (where torserver is the nickname of the server), use "MapAddress www.indymedia.org www.indymedia.org.torserver.exit".

Every NUM seconds consider whether to build a new circuit. (Default: 30 seconds)

Feel free to reuse a circuit that was first used at most NUM seconds ago, but never attach a new stream to a circuit that is too old. For hidden services, this applies to the last time a circuit was used, not the first. (Default: 10 minutes)

The Tor servers, defined by their identity fingerprints or nicknames, constitute a "family" of similar or co-administered servers, so never use any two of them in the same circuit. Defining a NodeFamily is only needed when a server doesn’t list the family itself (with MyFamily). This option can be used multiple times.

If 1, Tor will not put two servers whose IP addresses are "too close" on the same circuit. Currently, two addresses are "too close" if they lie in the same /16 range. (Default: 1)

Advertise this port to listen for connections from Socks-speaking applications. Set this to 0 if you don’t want to allow application connections via SOCKS. Set it to "auto" to have Tor pick a port for you. (Default: 9050)

Bind to this address to listen for connections from Socks-speaking applications. (Default: 127.0.0.1) You can also specify a port (e.g. 192.168.0.1:9100). This directive can be specified multiple times to bind to multiple addresses/ports.

Set an entrance policy for this server, to limit who can connect to the SocksPort and DNSPort ports. The policies have the same form as exit policies below.

Let a socks connection wait NUM seconds handshaking, and NUM seconds unattached waiting for an appropriate circuit, before we fail it. (Default: 2 minutes.)

For each value in the comma separated list, Tor will track recent connections to hosts that match this value and attempt to reuse the same exit node for each. If the value is prepended with a '.', it is treated as matching an entire domain. If one of the values is just a '.', it means match everything. This option is useful if you frequently connect to sites that will expire all your authentication cookies (i.e. log you out) if your IP address changes. Note that this option does have the disadvantage of making it more clear that a given history is associated with a single user. However, most people who would wish to observe this will observe it through cookies or other protocol-specific means anyhow.

Since exit servers go up and down, it is desirable to expire the association between host and exit server after NUM seconds. The default is 1800 seconds (30 minutes).

When set (along with UseBridges), Tor will try to fetch bridge descriptors from the configured bridge authorities when feasible. It will fall back to a direct request if the authority responds with a 404. (Default: 0)

When set, Tor will fetch descriptors for each bridge listed in the "Bridge" config lines, and use these relays as both entry guards and directory guards. (Default: 0)

If this option is set to 1, we pick a few long-term entry servers, and try to stick with them. This is desirable because constantly changing servers increases the odds that an adversary who owns some servers will observe a fraction of your paths. (Defaults to 1.)

If UseEntryGuards is set to 1, we will try to pick a total of NUM routers as long-term entries for our circuits. (Defaults to 3.)

When this option is enabled, Tor will reject application connections that use unsafe variants of the socks protocol — ones that only provide an IP address, meaning the application is doing a DNS resolve first. Specifically, these are socks4 and socks5 when not doing remote DNS. (Defaults to 0.)

When this option is enabled, Tor will make a notice-level log entry for each connection to the Socks port indicating whether the request used a safe socks protocol or an unsafe one (see above entry on SafeSocks). This helps to determine whether an application using Tor is possibly leaking DNS requests. (Default: 0)

When this option is enabled, Tor will warn whenever a request is received that only contains an IP address instead of a hostname. Allowing applications to do DNS resolves themselves is usually a bad idea and can leak your location to attackers. (Default: 1)

When Tor needs to assign a virtual (unused) address because of a MAPADDRESS command from the controller or the AutomapHostsOnResolve feature, Tor picks an unassigned address from this range. (Default: 127.192.0.0/10)

When providing proxy server service to a network of computers using a tool like dns-proxy-tor, change this address to "10.192.0.0/10" or "172.16.0.0/12". The default VirtualAddrNetwork address range on a properly configured machine will route to the loopback interface. For local use, no change to the default VirtualAddrNetwork setting is needed.

When this option is disabled, Tor blocks hostnames containing illegal characters (like @ and :) rather than sending them to an exit node to be resolved. This helps trap accidental attempts to resolve URLs and so on. (Default: 0)

If enabled, we convert "www.google.com.foo.exit" addresses on the SocksPort/TransPort/NATDPort into "www.google.com" addresses that exit from the node "foo". Disabled by default since attacking websites and exit relays can use it to manipulate your path selection. (Default: 0)

When this option is disabled, Tor uses the public key step for the first hop of creating circuits. Skipping it is generally safe since we have already used TLS to authenticate the relay and to establish forward-secure keys. Turning this option off makes circuit building slower.

Note that Tor will always use the public key step for the first hop if it’s operating as a relay, and it will never use the public key step if it doesn’t yet know the onion key of the first hop. (Default: 1)

If non-zero, enables transparent proxy support on PORT (by convention, 9040). Requires OS support for transparent proxies, such as BSDs' pf or Linux’s IPTables. If you’re planning to use Tor as a transparent proxy for a network, you’ll want to examine and change VirtualAddrNetwork from the default setting. You’ll also want to set the TransListenAddress option for the network you’d like to proxy. Set it to "auto" to have Tor pick a port for you. (Default: 0).

Bind to this address to listen for transparent proxy connections. (Default: 127.0.0.1). This is useful for exporting a transparent proxy server to an entire network.

Allow old versions of ipfw (as included in old versions of FreeBSD, etc.) to send connections through Tor using the NATD protocol. This option is only for people who cannot use TransPort. Set it to "auto" to have Tor pick a port for you. (Default: 0)

Bind to this address to listen for NATD connections. (Default: 127.0.0.1).

When this option is enabled, and we get a request to resolve an address that ends with one of the suffixes in AutomapHostsSuffixes, we map an unused virtual address to that address, and return the new virtual address. This is handy for making ".onion" addresses work with applications that resolve an address and then connect to it. (Default: 0).

A comma-separated list of suffixes to use with AutomapHostsOnResolve. The "." suffix is equivalent to "all addresses." (Default: .exit,.onion).

If non-zero, Tor listens for UDP DNS requests on this port and resolves them anonymously. Set it to "auto" to have Tor pick a port for you. (Default: 0).

Bind to this address to listen for DNS connections. (Default: 127.0.0.1).

If true, Tor does not believe any anonymously retrieved DNS answer that tells it that an address resolves to an internal address (like 127.0.0.1 or 192.168.0.1). This option prevents certain browser-based attacks; don’t turn it off unless you know what you’re doing. (Default: 1).

If true, Tor does not try to fulfill requests to connect to an internal address (like 127.0.0.1 or 192.168.0.1) unless a exit node is specifically requested (for example, via a .exit hostname, or a controller request). (Default: 1).

If true, Tor downloads and caches "extra-info" documents. These documents contain information about servers other than the information in their regular router descriptors. Tor does not use this information for anything itself; to save bandwidth, leave this option turned off. (Default: 0).

If Tor doesn’t have a cached networkstatus file, it starts out using this one instead. Even if this file is out of date, Tor can still use it to learn about directory mirrors, so it doesn’t need to put load on the authorities. (Default: None).

Tells Tor to issue a warnings whenever the user tries to make an anonymous connection to one of these ports. This option is designed to alert users to services that risk sending passwords in the clear. (Default: 23,109,110,143).

Like WarnPlaintextPorts, but instead of warning about risky port uses, Tor will instead refuse to make the connection. (Default: None).

When this option is set, the attached Tor controller can use relays that have the AllowSingleHopExits option turned on to build one-hop Tor connections. (Default: 0)

The IP address or fully qualified domain name of this server (e.g. moria.mit.edu). You can leave this unset, and Tor will guess your IP address. This IP address is the one used to tell clients and other servers where to find your Tor server; it doesn’t affect the IP that your Tor client binds to. To bind to a different address, use the *ListenAddress and OutboundBindAddress options.

This option controls whether clients can use this server as a single hop proxy. If set to 1, clients can use this server as an exit even if it is the only hop in the circuit. Note that most clients will refuse to use servers that set this option, since most clients have ExcludeSingleHopRelays set. (Default: 0)

This option is used when bootstrapping a new Tor network. If set to 1, don’t do self-reachability testing; just upload your server descriptor immediately. If AuthoritativeDirectory is also set, this option instructs the dirserver to bypass remote reachability testing too and list all connected servers as running.

Sets the relay to act as a "bridge" with respect to relaying connections from bridge users to the Tor network. It mainly causes Tor to publish a server descriptor to the bridge database, rather than publishing a relay descriptor to the public directory authorities.

Administrative contact information for server. This line might get picked up by spam harvesters, so you may want to obscure the fact that it’s an email address.

Set an exit policy for this server. Each policy is of the form "accept|reject ADDR[/MASK][:PORT]". If /MASK is omitted then this policy just applies to the host given. Instead of giving a host or network you can also use "*" to denote the universe (0.0.0.0/0). PORT can be a single port number, an interval of ports "FROM_PORT-TO_PORT", or "*". If PORT is omitted, that means "*".

For example, "accept 18.7.22.69:*,reject 18.0.0.0/8:*,accept *:*" would reject any traffic destined for MIT except for web.mit.edu, and accept anything else.

To specify all internal and link-local networks (including 0.0.0.0/8, 169.254.0.0/16, 127.0.0.0/8, 192.168.0.0/16, 10.0.0.0/8, and 172.16.0.0/12), you can use the "private" alias instead of an address. These addresses are rejected by default (at the beginning of your exit policy), along with your public IP address, unless you set the ExitPolicyRejectPrivate config option to 0. For example, once you’ve done that, you could allow HTTP to 127.0.0.1 and block all other connections to 172.16.0.)

Bind to this address to listen for connections from Socks-speaking applications. (Default: 127.0.0.1) You can also specify a port (e.g. 192.168.0.1:9100). This directive can be specified multiple times to bind to multiple addresses/ports.

Set an entrance policy for this server, to limit who can connect to the SocksPort and DNSPort ports. The policies have the same form as exit policies below.

Let a socks connection wait NUM seconds handshaking, and NUM seconds unattached waiting for an appropriate circuit, before we fail it. (Default: 2 minutes.)

For each value in the comma separated list, Tor will track recent connections to hosts that match this value and attempt to reuse the same exit node for each. If the value is prepended with a '.', it is treated as matching an entire domain. If one of the values is just a '.', it means match everything. This option is useful if you frequently connect to sites that will expire all your authentication cookies (i.e. log you out) if your IP address changes. Note that this option does have the disadvantage of making it more clear that a given history is associated with a single user. However, most people who would wish to observe this will observe it through cookies or other protocol-specific means anyhow.

Since exit servers go up and down, it is desirable to expire the association between host and exit server after NUM seconds. The default is 1800 seconds (30 minutes).

When set (along with UseBridges), Tor will try to fetch bridge descriptors from the configured bridge authorities when feasible. It will fall back to a direct request if the authority responds with a 404. (Default: 0)

When set, Tor will fetch descriptors for each bridge listed in the "Bridge" config lines, and use these relays as both entry guards and directory guards. (Default: 0)

If this option is set to 1, we pick a few long-term entry servers, and try to stick with them. This is desirable because constantly changing servers increases the odds that an adversary who owns some servers will observe a fraction of your paths. (Defaults to 1.)

If UseEntryGuards is set to 1, we will try to pick a total of NUM routers as long-term entries for our circuits. (Defaults to 3.)

When this option is enabled, Tor will reject application connections that use unsafe variants of the socks protocol — ones that only provide an IP address, meaning the application is doing a DNS resolve first. Specifically, these are socks4 and socks5 when not doing remote DNS. (Defaults to 0.)

When this option is enabled, Tor will make a notice-level log entry for each connection to the Socks port indicating whether the request used a safe socks protocol or an unsafe one (see above entry on SafeSocks). This helps to determine whether an application using Tor is possibly leaking DNS requests. (Default: 0)

When this option is enabled, Tor will warn whenever a request is received that only contains an IP address instead of a hostname. Allowing applications to do DNS resolves themselves is usually a bad idea and can leak your location to attackers. (Default: 1)

When Tor needs to assign a virtual (unused) address because of a MAPADDRESS command from the controller or the AutomapHostsOnResolve feature, Tor picks an unassigned address from this range. (Default: 127.192.0.0/10)

When providing proxy server service to a network of computers using a tool like dns-proxy-tor, change this address to "10.192.0.0/10" or "172.16.0.0/12". The default VirtualAddrNetwork address range on a properly configured machine will route to the loopback interface. For local use, no change to the default VirtualAddrNetwork setting is needed.

When this option is disabled, Tor blocks hostnames containing illegal characters (like @ and :) rather than sending them to an exit node to be resolved. This helps trap accidental attempts to resolve URLs and so on. (Default: 0)

If enabled, we convert "www.google.com.foo.exit" addresses on the SocksPort/TransPort/NATDPort into "www.google.com" addresses that exit from the node "foo". Disabled by default since attacking websites and exit relays can use it to manipulate your path selection. (Default: 0)

When this option is disabled, Tor uses the public key step for the first hop of creating circuits. Skipping it is generally safe since we have already used TLS to authenticate the relay and to establish forward-secure keys. Turning this option off makes circuit building slower.

Note that Tor will always use the public key step for the first hop if it’s operating as a relay, and it will never use the public key step if it doesn’t yet know the onion key of the first hop. (Default: 1)

If non-zero, enables transparent proxy support on PORT (by convention, 9040). Requires OS support for transparent proxies, such as BSDs' pf or Linux’s IPTables. If you’re planning to use Tor as a transparent proxy for a network, you’ll want to examine and change VirtualAddrNetwork from the default setting. You’ll also want to set the TransListenAddress option for the network you’d like to proxy. Set it to "auto" to have Tor pick a port for you. (Default: 0).

Bind to this address to listen for transparent proxy connections. (Default: 127.0.0.1). This is useful for exporting a transparent proxy server to an entire network.

Allow old versions of ipfw (as included in old versions of FreeBSD, etc.) to send connections through Tor using the NATD protocol. This option is only for people who cannot use TransPort. Set it to "auto" to have Tor pick a port for you. (Default: 0)

Bind to this address to listen for NATD connections. (Default: 127.0.0.1).

When this option is enabled, and we get a request to resolve an address that ends with one of the suffixes in AutomapHostsSuffixes, we map an unused virtual address to that address, and return the new virtual address. This is handy for making ".onion" addresses work with applications that resolve an address and then connect to it. (Default: 0).

A comma-separated list of suffixes to use with AutomapHostsOnResolve. The "." suffix is equivalent to "all addresses." (Default: .exit,.onion).

If non-zero, Tor listens for UDP DNS requests on this port and resolves them anonymously. Set it to "auto" to have Tor pick a port for you. (Default: 0).

Bind to this address to listen for DNS connections. (Default: 127.0.0.1).

If true, Tor does not believe any anonymously retrieved DNS answer that tells it that an address resolves to an internal address (like 127.0.0.1 or 192.168.0.1). This option prevents certain browser-based attacks; don’t turn it off unless you know what you’re doing. (Default: 1).

If true, Tor does not try to fulfill requests to connect to an internal address (like 127.0.0.1 or 192.168.0.1) unless a exit node is specifically requested (for example, via a .exit hostname, or a controller request). (Default: 1).

If true, Tor downloads and caches "extra-info" documents. These documents contain information about servers other than the information in their regular router descriptors. Tor does not use this information for anything itself; to save bandwidth, leave this option turned off. (Default: 0).

If Tor doesn’t have a cached networkstatus file, it starts out using this one instead. Even if this file is out of date, Tor can still use it to learn about directory mirrors, so it doesn’t need to put load on the authorities. (Default: None).

Tells Tor to issue a warnings whenever the user tries to make an anonymous connection to one of these ports. This option is designed to alert users to services that risk sending passwords in the clear. (Default: 23,109,110,143).

Like WarnPlaintextPorts, but instead of warning about risky port uses, Tor will instead refuse to make the connection. (Default: None).

When this option is set, the attached Tor controller can use relays that have the AllowSingleHopExits option turned on to build one-hop Tor connections. (Default: 0)

The IP address or fully qualified domain name of this server (e.g. moria.mit.edu). You can leave this unset, and Tor will guess your IP address. This IP address is the one used to tell clients and other servers where to find your Tor server; it doesn’t affect the IP that your Tor client binds to. To bind to a different address, use the *ListenAddress and OutboundBindAddress options.

This option controls whether clients can use this server as a single hop proxy. If set to 1, clients can use this server as an exit even if it is the only hop in the circuit. Note that most clients will refuse to use servers that set this option, since most clients have ExcludeSingleHopRelays set. (Default: 0)

This option is used when bootstrapping a new Tor network. If set to 1, don’t do self-reachability testing; just upload your server descriptor immediately. If AuthoritativeDirectory is also set, this option instructs the dirserver to bypass remote reachability testing too and list all connected servers as running.

Sets the relay to act as a "bridge" with respect to relaying connections from bridge users to the Tor network. It mainly causes Tor to publish a server descriptor to the bridge database, rather than publishing a relay descriptor to the public directory authorities.

Administrative contact information for server. This line might get picked up by spam harvesters, so you may want to obscure the fact that it’s an email address.

Set an exit policy for this server. Each policy is of the form "accept|reject ADDR[/MASK][:PORT]". If /MASK is omitted then this policy just applies to the host given. Instead of giving a host or network you can also use "*" to denote the universe (0.0.0.0/0). PORT can be a single port number, an interval of ports "FROM_PORT-TO_PORT", or "*". If PORT is omitted, that means "*".

For example, "accept 18.7.22.69:*,reject 18.0.0.0/8:*,accept *:*" would reject any traffic destined for MIT except for web.mit.edu, and accept anything else.

To specify all internal and link-local networks (including 0.0.0.0/8, 169.254.0.0/16, 127.0.0.0/8, 192.168.0.0/16, 10.0.0.0/8, and 172.16.0.0/12), you can use the "private" alias instead of an address. These addresses are rejected by default (at the beginning of your exit policy), along with your public IP address, unless you set the ExitPolicyRejectPrivate config option to 0. For example, once you’ve done that, you could allow HTTP to 127.0.0.1 and block all other connections to 172.16.0.)

Bind to this address to listen for connections from Socks-speaking applications. (Default: 127.0.0.1) You can also specify a port (e.g. 192.168.0.1:9100). This directive can be specified multiple times to bind to multiple addresses/ports.

Set an entrance policy for this server, to limit who can connect to the SocksPort and DNSPort ports. The policies have the same form as exit policies below.

Let a socks connection wait NUM seconds handshaking, and NUM seconds unattached waiting for an appropriate circuit, before we fail it. (Default: 2 minutes.)

For each value in the comma separated list, Tor will track recent connections to hosts that match this value and attempt to reuse the same exit node for each. If the value is prepended with a '.', it is treated as matching an entire domain. If one of the values is just a '.', it means match everything. This option is useful if you frequently connect to sites that will expire all your authentication cookies (i.e. log you out) if your IP address changes. Note that this option does have the disadvantage of making it more clear that a given history is associated with a single user. However, most people who would wish to observe this will observe it through cookies or other protocol-specific means anyhow.

Since exit servers go up and down, it is desirable to expire the association between host and exit server after NUM seconds. The default is 1800 seconds (30 minutes).

When set (along with UseBridges), Tor will try to fetch bridge descriptors from the configured bridge authorities when feasible. It will fall back to a direct request if the authority responds with a 404. (Default: 0)

When set, Tor will fetch descriptors for each bridge listed in the "Bridge" config lines, and use these relays as both entry guards and directory guards. (Default: 0)

If this option is set to 1, we pick a few long-term entry servers, and try to stick with them. This is desirable because constantly changing servers increases the odds that an adversary who owns some servers will observe a fraction of your paths. (Defaults to 1.)

If UseEntryGuards is set to 1, we will try to pick a total of NUM routers as long-term entries for our circuits. (Defaults to 3.)

When this option is enabled, Tor will reject application connections that use unsafe variants of the socks protocol — ones that only provide an IP address, meaning the application is doing a DNS resolve first. Specifically, these are socks4 and socks5 when not doing remote DNS. (Defaults to 0.)

When this option is enabled, Tor will make a notice-level log entry for each connection to the Socks port indicating whether the request used a safe socks protocol or an unsafe one (see above entry on SafeSocks). This helps to determine whether an application using Tor is possibly leaking DNS requests. (Default: 0)

When this option is enabled, Tor will warn whenever a request is received that only contains an IP address instead of a hostname. Allowing applications to do DNS resolves themselves is usually a bad idea and can leak your location to attackers. (Default: 1)

When Tor needs to assign a virtual (unused) address because of a MAPADDRESS command from the controller or the AutomapHostsOnResolve feature, Tor picks an unassigned address from this range. (Default: 127.192.0.0/10)

When providing proxy server service to a network of computers using a tool like dns-proxy-tor, change this address to "10.192.0.0/10" or "172.16.0.0/12". The default VirtualAddrNetwork address range on a properly configured machine will route to the loopback interface. For local use, no change to the default VirtualAddrNetwork setting is needed.

When this option is disabled, Tor blocks hostnames containing illegal characters (like @ and :) rather than sending them to an exit node to be resolved. This helps trap accidental attempts to resolve URLs and so on. (Default: 0)

If enabled, we convert "www.google.com.foo.exit" addresses on the SocksPort/TransPort/NATDPort into "www.google.com" addresses that exit from the node "foo". Disabled by default since attacking websites and exit relays can use it to manipulate your path selection. (Default: 0)

When this option is disabled, Tor uses the public key step for the first hop of creating circuits. Skipping it is generally safe since we have already used TLS to authenticate the relay and to establish forward-secure keys. Turning this option off makes circuit building slower.

Note that Tor will always use the public key step for the first hop if it’s operating as a relay, and it will never use the public key step if it doesn’t yet know the onion key of the first hop. (Default: 1)

If non-zero, enables transparent proxy support on PORT (by convention, 9040). Requires OS support for transparent proxies, such as BSDs' pf or Linux’s IPTables. If you’re planning to use Tor as a transparent proxy for a network, you’ll want to examine and change VirtualAddrNetwork from the default setting. You’ll also want to set the TransListenAddress option for the network you’d like to proxy. Set it to "auto" to have Tor pick a port for you. (Default: 0).

Bind to this address to listen for transparent proxy connections. (Default: 127.0.0.1). This is useful for exporting a transparent proxy server to an entire network.

Allow old versions of ipfw (as included in old versions of FreeBSD, etc.) to send connections through Tor using the NATD protocol. This option is only for people who cannot use TransPort. Set it to "auto" to have Tor pick a port for you. (Default: 0)

Bind to this address to listen for NATD connections. (Default: 127.0.0.1).

When this option is enabled, and we get a request to resolve an address that ends with one of the suffixes in AutomapHostsSuffixes, we map an unused virtual address to that address, and return the new virtual address. This is handy for making ".onion" addresses work with applications that resolve an address and then connect to it. (Default: 0).

A comma-separated list of suffixes to use with AutomapHostsOnResolve. The "." suffix is equivalent to "all addresses." (Default: .exit,.onion).

If non-zero, Tor listens for UDP DNS requests on this port and resolves them anonymously. Set it to "auto" to have Tor pick a port for you. (Default: 0).

Bind to this address to listen for DNS connections. (Default: 127.0.0.1).

If true, Tor does not believe any anonymously retrieved DNS answer that tells it that an address resolves to an internal address (like 127.0.0.1 or 192.168.0.1). This option prevents certain browser-based attacks; don’t turn it off unless you know what you’re doing. (Default: 1).

If true, Tor does not try to fulfill requests to connect to an internal address (like 127.0.0.1 or 192.168.0.1) unless a exit node is specifically requested (for example, via a .exit hostname, or a controller request). (Default: 1).

If true, Tor downloads and caches "extra-info" documents. These documents contain information about servers other than the information in their regular router descriptors. Tor does not use this information for anything itself; to save bandwidth, leave this option turned off. (Default: 0).

If Tor doesn’t have a cached networkstatus file, it starts out using this one instead. Even if this file is out of date, Tor can still use it to learn about directory mirrors, so it doesn’t need to put load on the authorities. (Default: None).

Tells Tor to issue a warnings whenever the user tries to make an anonymous connection to one of these ports. This option is designed to alert users to services that risk sending passwords in the clear. (Default: 23,109,110,143).

Like WarnPlaintextPorts, but instead of warning about risky port uses, Tor will instead refuse to make the connection. (Default: None).

When this option is set, the attached Tor controller can use relays that have the AllowSingleHopExits option turned on to build one-hop Tor connections. (Default: 0)

The IP address or fully qualified domain name of this server (e.g. moria.mit.edu). You can leave this unset, and Tor will guess your IP address. This IP address is the one used to tell clients and other servers where to find your Tor server; it doesn’t affect the IP that your Tor client binds to. To bind to a different address, use the *ListenAddress and OutboundBindAddress options.

This option controls whether clients can use this server as a single hop proxy. If set to 1, clients can use this server as an exit even if it is the only hop in the circuit. Note that most clients will refuse to use servers that set this option, since most clients have ExcludeSingleHopRelays set. (Default: 0)

This option is used when bootstrapping a new Tor network. If set to 1, don’t do self-reachability testing; just upload your server descriptor immediately. If AuthoritativeDirectory is also set, this option instructs the dirserver to bypass remote reachability testing too and list all connected servers as running.

Sets the relay to act as a "bridge" with respect to relaying connections from bridge users to the Tor network. It mainly causes Tor to publish a server descriptor to the bridge database, rather than publishing a relay descriptor to the public directory authorities.

Administrative contact information for server. This line might get picked up by spam harvesters, so you may want to obscure the fact that it’s an email address.

Set an exit policy for this server. Each policy is of the form "accept|reject ADDR[/MASK][:PORT]". If /MASK is omitted then this policy just applies to the host given. Instead of giving a host or network you can also use "*" to denote the universe (0.0.0.0/0). PORT can be a single port number, an interval of ports "FROM_PORT-TO_PORT", or "*". If PORT is omitted, that means "*".

For example, "accept 18.7.22.69:*,reject 18.0.0.0/8:*,accept *:*" would reject any traffic destined for MIT except for web.mit.edu, and accept anything else.

To specify all internal and link-local networks (including 0.0.0.0/8, 169.254.0.0/16, 127.0.0.0/8, 192.168.0.0/16, 10.0.0.0/8, and 172.16.0.0/12), you can use the "private" alias instead of an address. These addresses are rejected by default (at the beginning of your exit policy), along with your public IP address, unless you set the ExitPolicyRejectPrivate config option to 0. For example,