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Set default value of DecrementTTL to "no".

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Decrementing the TTL causes IPv6 to fail when Mode = switch, and there may be
other unforeseen side-effects.
This commit is contained in:
Guus Sliepen 2012-03-23 13:18:36 +01:00
parent c373de2e98
commit b5e3bf1a85
3 changed files with 7 additions and 3 deletions
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4
doc/tinc.conf.5.in
View file

@ -180,13 +180,15 @@ If you don't specify a host with
won't try to connect to other daemons at all, won't try to connect to other daemons at all,
and will instead just listen for incoming connections. 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, When enabled,
.Nm tinc .Nm tinc
will decrement the Time To Live field in IPv4 packets, or the Hop Limit field in IPv6 packets, 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, 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, and will drop packets that have a TTL value of zero,
in which case it will send an ICMP Time Exceeded packet back. 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 .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. The virtual network device to use.

4
doc/tinc.texi
View file

@ -794,12 +794,14 @@ tinc won't try to connect to other daemons at all,
and will instead just listen for incoming connections. and will instead just listen for incoming connections.
@cindex DecrementTTL @cindex DecrementTTL
@item DecrementTTL = <yes | no> (yes) @item DecrementTTL = <yes | no> (no)
When enabled, tinc will decrement the Time To Live field in IPv4 packets, or the Hop Limit field in IPv6 packets, 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, 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, and will drop packets that have a TTL value of zero,
in which case it will send an ICMP Time Exceeded packet back. 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 @cindex Device
@item Device = <@var{device}> (@file{/dev/tap0}, @file{/dev/net/tun} or other depending on platform) @item Device = <@var{device}> (@file{/dev/tap0}, @file{/dev/net/tun} or other depending on platform)
The virtual network device to use. The virtual network device to use.

2
src/route.c
View file

@ -34,7 +34,7 @@
rmode_t routing_mode = RMODE_ROUTER; rmode_t routing_mode = RMODE_ROUTER;
fmode_t forwarding_mode = FMODE_INTERNAL; fmode_t forwarding_mode = FMODE_INTERNAL;
bool decrement_ttl = true; bool decrement_ttl = false;
bool directonly = false; bool directonly = false;
bool priorityinheritance = false; bool priorityinheritance = false;
int macexpire = 600; int macexpire = 600;