is selected, then depending on the operating system both IPv4 and IPv6 or just
IPv6 listening sockets will be created.
-.It Va BindToAddress Li = Ar address Bq experimental
+.It Va BindToAddress Li = Ar address Oo Ar port Oc Bq experimental
If your computer has more than one IPv4 or IPv6 address,
.Nm tinc
will by default listen on all of them for incoming connections.
.Va BindToAddress
variables may be specified,
in which case listening sockets for each specified address are made.
-
+.Pp
+If no
+.Ar port
+is specified, the socket will be bound to the port specified by the
+.Va Port
+option, or to port 655 if neither is given.
+To only bind to a specific port but not to a specific address, use
+.Li *
+for the
+.Ar address .
.Pp
This option may not work on all platforms.
won't try to connect to other daemons at all,
and will instead just listen for incoming connections.
-.It Va DecrementTTL Li = yes | no Po yes Pc
+.It Va DecrementTTL Li = yes | no Po no Pc Bq experimental
When enabled,
.Nm tinc
will decrement the Time To Live field in IPv4 packets, or the Hop Limit field in IPv6 packets,
before forwarding a received packet to the virtual network device or to another node,
and will drop packets that have a TTL value of zero,
in which case it will send an ICMP Time Exceeded packet back.
+.Pp
+Do not use this option if you use switch mode and want to use IPv6.
.It Va Device Li = Ar device Po Pa /dev/tap0 , Pa /dev/net/tun No or other depending on platform Pc
The virtual network device to use.
Packets received for the local node are written to the raw socket.
However, at least on Linux, the operating system does not process IP packets destined for the local host.
+.It multicast
+Open a multicast UDP socket and bind it to the address and port (separated by spaces) and optionally a TTL value specified using
+.Va Device .
+Packets are read from and written to this multicast socket.
+This can be used to connect to UML, QEMU or KVM instances listening on the same multicast address.
+Do NOT connect multiple
+.Nm tinc
+daemons to the same multicast address, this will very likely cause routing loops.
+Also note that this can cause decrypted VPN packets to be sent out on a real network if misconfigured.
+
.It uml Pq not compiled in by default
Create a UNIX socket with the filename specified by
.Va Device ,
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.
+.It Va LocalDiscovery Li = yes | no Po no Pc Bq experimental
+When enabled,
+.Nm tinc
+will try to detect peers that are on the same local network.
+This will allow direct communication using LAN addresses, even if both peers are behind a NAT
+and they only ConnectTo a third node outside the NAT,
+which normally would prevent the peers from learning each other's LAN address.
+
+.Pp
+Currently, local discovery is implemented by sending broadcast packets to the LAN during path MTU discovery.
+This feature may not work in all possible situations.
+
.It Va MACExpire Li = Ar seconds Pq 600
This option controls the amount of time MAC addresses are kept before they are removed.
This only has effect when
no secrets are revealed by sending out this information.
.Bl -tag -width indent
-.It Va Address Li = Ar address Oo port Oc Bq recommended
+.It Va Address Li = Ar address Oo Ar port Oc Bq recommended
The IP address or hostname of this tinc daemon on the real network.
This will only be used when trying to make an outgoing connection to this tinc daemon.
Optionally, a port can be specified to use for this address.
Subnets can either be single MAC, IPv4 or IPv6 addresses,
in which case a subnet consisting of only that single address is assumed,
or they can be a IPv4 or IPv6 network address with a prefixlength.
-Shorthand notations are not supported.
For example, IPv4 subnets must be in a form like 192.168.1.0/24,
where 192.168.1.0 is the network address and 24 is the number of bits set in the netmask.
Note that subnets like 192.168.1.1/24 are invalid!
Read a networking HOWTO/FAQ/guide if you don't understand this.
-IPv6 subnets are notated like fec0:0:0:1:0:0:0:0/64.
+IPv6 subnets are notated like fec0:0:0:1::/64.
MAC addresses are notated like 0:1a:2b:3c:4d:5e.
.Pp
projects / tinc / blobdiff