Network Problems with Linux-Bridges after update
pschelle at ipb-halle.de
Thu Sep 27 13:50:39 UTC 2012
I have a problem with using Linux-bridges on Ubuntu-Server 12.04 after
upgrading on Monday 24th September.
The Problem is that all incoming Packages are dropped/lost between the
physical device and the bridge. I can see, by using tcpdump and pinging,
that the icmp-replays hit the physical device but not the bridge.
setting ´sysctl net.bridge.bridge-nf-call-iptables=0' prevents the
problem and the machine has full network access again.
is preventing me from using the workaround at the right place(adding it
to sysctl.conf) because the machine is subject to automated shutdowns
and boots (for power-saving) and there for it can not be done by hand too.
For the environment:
The server is a quiet minimal machine with KVM installed as host for
virtual machine in a cloudenviroment (OpenNebula) and is using the
bridges to create a HPC-Cluster of virtual machines with other servers
in the network.
Currently 2 machines are affected(one freshly installed today 27.9, the
other one upgraded on 24.9). Other machines are not fully up to
date(using Linux-image 3.2.0-30) and working fine.
If some one can point out what is causing this problem or has a solution
i would be thankful.
If you need any more info I can provide this also testing is currently
Thanks in advance
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