[Bug 997978] Re: KVM images lose connectivity with bridged network

Øyvind Jelstad oyvind at jelstad.org
Thu Jul 31 16:35:30 UTC 2014


Looks like I have this problem on 12.04.1 LTS with kernel
3.2.0-67-generic #101-Ubuntu SMP Tue Jul 15 17:46:11 UTC 2014 x86_64
x86_64 x86_64 GNU/Linux on the host and Debian Wheezy on the guest (SMP
Debian 3.2.60-1+deb7u3 x86_64 GNU/Linux)

The guest will occationally loose connection with other hosts on the LAN, and their entries in the arp table on the guest  are gone. 
Only sporadic forwarding of arp replies on the host back to the guest seem to be the problem. 

Dumping arp request (triggered by a ping from guest) on the bridge
external (real) interface on the host catches both requests and replies,
while the same dump on vnet0 misses replies for minutes until a reply
suddeny comes through and reestablishes connection.

I am using virtio interface. It makes no difference if I change to
e1000. FW policy is ACCEPT on all tables.

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https://bugs.launchpad.net/bugs/997978

Title:
  KVM images lose connectivity with bridged network

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