.PP
.SH "VARIABLES"
.PP
-Here are all valid variables, listed in alphabetical order:
-.TP
-\fBConnectPort = \fIport\fR
-Connect to the upstream host (given with the \fBConnectTo\fR
-directive) on port \fIport\fR. \fIport\fR may be given in decimal
-(default), octal (when preceded by a single zero) or hexadecimal
-(prefixed with \fB0x\fR). \fIport\fR is the port number for both the
-UDP and the TCP (meta) connections.
-.TP
-\fBConnectTo = \fB(\fIIP address\fB|\fIhostname\fB)\fR
-Specifies which host to connect to on startup. If the
-\fBConnectPort\fR variable is omitted, then tinc will try to connect
-to port 655.
+Here are all valid variables, listed in alphabetical order. The default
+value, required or optional is given between parentheses.
+.TP
+\fBConnectPort\fR = <\fIport\fR> (655)
+Connect to the upstream host (given with the \fBConnectTo\fR directive) on
+port \fIport\fR. port may be given in decimal (default), octal (when preceded
+by a single zero) or hexadecimal (prefixed with 0x). \fIport\fR is the port
+number for both the UDP and the TCP (meta) connections.
+.TP
+\fBConnectTo\fR = <\fIIP address|hostname\fR> (optional)
+Specifies which host to connect to on startup. Multiple \fBConnectTo\fR variables
+may be specified, if connecting to the first one fails then tinc will try
+the next one, and so on. It is possible to specify hostnames for dynamic IP
+addresses (like those given on dyndns.org), tinc will not cache the resolved
+IP address.
-If you don't specify a host with \fBConnectTo\fR, tinc won't connect
-at all, and will instead just listen for incoming connections. Only
-the initiator of a tinc VPN should need this.
+If you don't specify a host with \fBConnectTo\fR, regardless of whether a
+value for \fBConnectPort\fR is given, tinc won't connect at all, and will
+instead just listen for incoming connections.
+.TP
+\fBHostnames\fR = <\fIyes|no\fR> (no)
+This option selects whether IP addresses (both real and on the VPN) should
+be resolved. Since DNS lookups are blocking, it might affect tinc's
+efficiency, even stopping the daemon for a few seconds everytime it does
+a lookup if your DNS server is not responding.
+
+This does not affect resolving hostnames to IP addresses from the configuration
+file.
+.TP
+\fBIndirectData\fR = <\fIyes|no\fR> (no)
+This option specifies whether other tinc daemons besides the one you
+specified with \fBConnectTo\fR can make a direct connection to you. This is
+especially useful if you are behind a firewall and it is impossible
+to make a connection from the outside to your tinc daemon. Otherwise,
+it is best to leave this option out or set it to no.
.TP
-\fBKeyExpire = \fIs\fR
-The secret (and public) key expires after \fIs\fR seconds. The default
-is 3600 seconds, or one hour.
+\fBInterface\fR = <\fIdevice\fR> (optional)
+If you have more than one network interface in your computer, tinc will by
+default listen on all of them for incoming connections. It is possible to
+bind tinc to a single interface like eth0 or ppp0 with this variable.
+.TP
+\fBInterfaceIP\fR = <\fIlocal address\fR> (optional)
+If your computer has more than one IP address on a single interface (for example
+if you are running virtual hosts), tinc will by default listen on all of them for
+incoming connections. It is possible to bind tinc to a single IP address with
+this variable. It is still possible to listen on several interfaces at the same
+time though, if they share the same IP address.
+.TP
+\fBKeyExpire\fR = <\fIseconds\fR> (3600)
+This option controls the time the encryption keys used to encrypt the data
+are valid. It is common practice to change keys at regular intervals to
+make it even harder for crackers, even though it is thought to be nearly
+impossible to crack a single key.
+.TP
+\fBListenPort\fR = <\fIport\fR> (655)
+Listen on local port \fIport\fR. The computer connecting to this daemon should
+use this number as the argument for his \fBConnectPort\fR.
+.TP
+\fBMyOwnVPNIP\fR = <\fIlocal address[/maskbits]\fR> (required)
+The \fIlocal address\fR is the number that the daemon will propagate to
+other daemons on the network when it is identifying itself. Hence this
+will be the file name of the passphrase file that the other end expects
+to find the passphrase in.
-If you make it shorter, a lot of time and bandwidth is spent
-negotiating over the new keys. If you make it longer, you make
-yourself more vulnerable to crackers, because they have more data to
-work with. The best value depends on the speed of the link, and the
-amount of data that goes over it.
-.TP
-\fBListenPort = \fIport\fR
-Listen on local port \fIport\fR. The computer connecting to this
-daemon should use this number as the argument for his
-\fBConnectPort\fR. Again, the default is 655.
-.TP
-\fBMyOwnVPNIP = \fInetwork address\fR[\fB/\fImaskbits\fR]
-The \fInetwork address\fR is the number that the daemon will propagate
-to other daemons on the network when it is identifying itself. Hence
-this will be the file name of the passphrase file that the other end
-expects to find the passphrase in.
+The local address is the IP address of the tap device, not the real IP
+address of the host running tincd. Due to changes in recent kernels, it
+is also necessary that you make the ethernet (also known as MAC) address
+equal to the IP address (see the example).
\fImaskbits\fR is the number of bits set to 1 in the netmask part.
.TP
-\fBMyVirtualIP = \fInetwork address\fR[\fB/\fImaskbits\fR]
+\fBMyVirtualIP\fR = <\fIlocal address[/maskbits]>
This is an alias for \fBMyOwnVPNIP\fR.
.TP
-\fBPassphrases = \fIdirectory\fR
-The directory where tinc will look for passphrases when someone tries
-to cennect. Please see the manpage for \fBgenauth\fR(8) for more
-information about passphrases as used by tinc.
+\fBPassphrases\fR = <\fIdirectory\fR> (/etc/tinc/NETNAME/passphrases)
+The directory where tinc will look for passphrases when someone tries to
+connect. Please see the manpage for genauth(8) for more information
+about passphrases as used by tinc.
.TP
-\fBPingTimeout = \fInumber\fR
-The number of seconds of inactivity that tinc will wait before sending
-a probe to the other end. If that other end doesn't answer within that
+\fBPingTimeout\fR = <\fIseconds\fR> (5)
+The number of seconds of inactivity that tinc will wait before sending a
+probe to the other end. If that other end doesn't answer within that
same amount of seconds, the connection is terminated, and the others
will be notified of this.
.TP
-\fBTapDevice = \fIdevice\fR
+\fBTapDevice\fR = <\fIdevice\fR> (/dev/tap0)
The ethertap device to use. Note that you can only use one device per
daemon. The info pages of the tinc package contain more information
-about configuring an ethertap device for linux.
+about configuring an ethertap device for Linux.
+.TP
+\fBTCPonly\fR = <\fIyes|no\fR> (no, experimental)
+If this variable is set to yes, then the packets are tunnelled over a TCP
+connection instead of a UDP connection. This is especially useful for those
+who want to run a tinc daemon from behind a masquerading firewall, or if
+UDP packet routing is disabled somehow. This is experimental code,
+try this at your own risk.
.TP
-\fBNetMask = \fImask\fR
+\fBVpnMask\fR = <\fImask\fR> (optional)
The mask that defines the scope of the entire VPN. This option is not used
by the tinc daemon itself, but can be used by startup scripts to configure
the ethertap devices correctly.
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