Re: Re: schein.debian.org

Pascal Hambourg writes:
> Gerald Turner a écrit :
>>
>> Sorry about all that noise, I simply changed interfaces like:
>>
>>    iface eth0 inet6 static
>>      address 2001:470:e861::8
>>      netmask 48
>
> The network prefix length should always be 64, unless you know exactly
> what you are doing.
>
>>   -  gateway 2001:470:e861::1
>>   +  up ip -6 route add 2000::/3 via 2001:470:e861::1 mtu 1480
>
> Using 2000::/3 instead of default or ::/0 for the default global unicast
> route was only necessary on very old (2.4 ?) kernels.
>
> The MTU 1480 suggests that there is some 6in4 tunnel encapsulation on
> the path and one node does not do its job properly. It could be either :
>
> - the remote tunnel endpoint has IPv6 MTU set to 1480 but does not send
> ICMPv6 "packet too big" when dropping too big a packet ;
> - the server or a node before it drops ICMPv6 "packet too big" ;
> - the remote tunnel endpoint has IPv6 MTU set to 1500 but does not
> fragment properly 6in4 datagrams ;
> - some node on the path drops 6in4 fragments ;
> - the local tunnel endpoint does not reassemble properly 6in4 fragments
>
> or many more causes.

It may be a local problem, e.g. see:

http://lists.debian.org/debian-user/2011/06/msg00040.html

-jeff


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