kernel: nd6_setmtu0: new link MTU on ng29 (1218) is too small for IPv6

[Bjoern A. Zeeb]

On 4. Jan 2012, at 12:11 , Sami Halabi wrote:

> Hi,
> i just tested the last log:
> %tail /var/log/messages
> Jan  3 23:21:50 mpd2 kernel: nd6_setmtu0: new link MTU on ng92 (1218) is
> too small for IPv6
> Jan  4 00:00:36 mpd2 kernel: nd6_setmtu0: new link MTU on ng105 (1218) is
> too small for IPv6
> Jan  4 00:34:48 mpd2 kernel: nd6_setmtu0: new link MTU on ng105 (1218) is
> too small for IPv6
> Jan  4 07:47:37 mpd2 kernel: nd6_setmtu0: new link MTU on ng100 (1218) is
> too small for IPv6
> Jan  4 08:31:55 mpd2 kernel: nd6_setmtu0: new link MTU on ng116 (1218) is
> too small for IPv6
> Jan  4 09:16:21 mpd2 kernel: nd6_setmtu0: new link MTU on ng123 (1218) is
> too small for IPv6
> Jan  4 12:55:32 mpd2 kernel: nd6_setmtu0: new link MTU on ng53 (1218) is
> too small for IPv6
> Jan  4 14:17:34 mpd2 kernel: nd6_setmtu0: new link MTU on ng120 (1218) is
> too small for IPv6
> %ifconfig ng120
> ng120: flags=88d1<UP,POINTOPOINT,RUNNING,NOARP,SIMPLEX,MULTICAST> metric 0
> mtu 1218
>        inet 188.64.96.5 --> 188.64.102.171 netmask 0xffffffff
> 
> so MTU is indeed 1218

But that MTU should be a result of ppp/LCP negotiations of individual sessions.
It seems you have peers thinking they want a really small MTU and you allow it?

/bz

-- 
Bjoern A. Zeeb                                 You have to have visions!
   It does not matter how good you are. It matters what good you do!