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Decrement TTL of incoming packets.

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Tinc will now, by default, decrement the TTL field of incoming IPv4 and IPv6
packets, before forwarding them to the virtual network device or to another
node. Packets with a TTL value of zero will be dropped, and an ICMP Time
Exceeded message will be sent back.

This behaviour can be disabled using the DecrementTTL option.
This commit is contained in:
Guus Sliepen 2012-02-20 16:34:02 +01:00
parent 6289859ab3
commit 0233b1d710
5 changed files with 67 additions and 0 deletions
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8
doc/tinc.conf.5.in
View file

@ -168,6 +168,14 @@ If you don't specify a host with
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
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.
.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.
.Nm tinc

7
doc/tinc.texi
View file

@ -785,6 +785,13 @@ If you don't specify a host with ConnectTo,
tinc won't try to connect to other daemons at all,
and will instead just listen for incoming connections.
@cindex DecrementTTL
@item DecrementTTL = <yes | no> (yes)
When enabled, 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.
@cindex Device
@item Device = <@var{device}> (@file{/dev/tap0}, @file{/dev/net/tun} or other depending on platform)
The virtual network device to use.