[Users] IPv6: PMTU disc is broken in stable RHEL5 kernel for VETH

[Benoit Branciard]

Hi,

Some days ago I submitted a bug to point out a problem we encountered in 
path MTU discovery not working properly for IPv6 VETH interfaces:

http://bugzilla.openvz.org/show_bug.cgi?id=1675

This report didn't receive any feedback for now.

Could someone have a look at this problem ?
PMTU discovery is a mandatory feature for proper IPv6 functionnality 
(apart from crippling down the MTU globally on the interface).

According to our tests done so far, the problem can be reproduced in any 
bridged VETH configuration, whatever interface is bridged in (a 
bare-metal physical one, a bonding, a VLAN, or even a VLAN over a bonding).

However, it does not show up with VENET interfaces in the 
distribution-standard config (arp-proxy-based routed mode); it appears 
to be veth-specific.


-- 
Benoit BRANCIARD

CRIR - SIS
Centre de Ressources Informatiques et du Réseau,
Service Infrastructures
http://crir.univ-paris1.fr
Université Paris 1 Panthéon-Sorbonne

Tel. 01 44 07 89 68

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