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.

diff --git a/doc/tinc.conf.5.in b/doc/tinc.conf.5.in
index d5757c8..fa62153 100644 (file)
--- 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.
 
 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.
 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.
 
 .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 9e8929b..bddc39a 100644 (file)
--- 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
 and will instead just listen for incoming connections.
 
 @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,
 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.
 
 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.
 @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 051deff..6eadb88 100644 (file)
--- a/src/route.c
+++ b/src/route.c
@@ -34,7 +34,7 @@
 
 rmode_t routing_mode = RMODE_ROUTER;
 fmode_t forwarding_mode = FMODE_INTERNAL;
 
 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;
 bool directonly = false;
 bool priorityinheritance = false;
 int macexpire = 600;