From b5e3bf1a85462f0c41638c11305d28f87af24395 Mon Sep 17 00:00:00 2001 From: Guus Sliepen Date: Fri, 23 Mar 2012 13:18:36 +0100 Subject: [PATCH] Set default value of DecrementTTL to "no". Decrementing the TTL causes IPv6 to fail when Mode = switch, and there may be other unforeseen side-effects. --- doc/tinc.conf.5.in | 4 +++- doc/tinc.texi | 4 +++- src/route.c | 2 +- 3 files changed, 7 insertions(+), 3 deletions(-) diff --git a/doc/tinc.conf.5.in b/doc/tinc.conf.5.in index d5757c82..fa621533 100644 --- a/doc/tinc.conf.5.in +++ b/doc/tinc.conf.5.in @@ -180,13 +180,15 @@ 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 +.It Va DecrementTTL Li = yes | no Po no 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. +.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. diff --git a/doc/tinc.texi b/doc/tinc.texi index 9e8929b0..bddc39a0 100644 --- a/doc/tinc.texi +++ b/doc/tinc.texi @@ -794,12 +794,14 @@ tinc won't try to connect to other daemons at all, and will instead just listen for incoming connections. @cindex DecrementTTL -@item DecrementTTL = (yes) +@item DecrementTTL = (no) 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. +Do not use this option if you use switch mode and want to use IPv6. + @cindex Device @item Device = <@var{device}> (@file{/dev/tap0}, @file{/dev/net/tun} or other depending on platform) The virtual network device to use. diff --git a/src/route.c b/src/route.c index 051deffb..6eadb888 100644 --- a/src/route.c +++ b/src/route.c @@ -34,7 +34,7 @@ rmode_t routing_mode = RMODE_ROUTER; fmode_t forwarding_mode = FMODE_INTERNAL; -bool decrement_ttl = true; +bool decrement_ttl = false; bool directonly = false; bool priorityinheritance = false; int macexpire = 600; -- 2.20.1