[Bug 377474] Re: bridge-utils ifupdown script should disable IPv6 address autoconfiguration for underlying interface

[Olaf Krische]

Salute,

just wanna bring to notice, that the suggested solution fixed our
problem with some of the virtual machines (kvm-85, debian lenny + latest
backport, tho).

Not sure, if it belongs into "wishlist" then.

The virtual machines use the bridge "br0" for having their own
interface, they run Java and get network traffic constantly.

We had the phenomenon of broken sockets. On the virtual machine the
"serving" socket was already gone while on the client side the socket
was still intact (established). As if the traffic gets swallowed
somewhere.

On the physical machine:

$ cat /etc/network/interfaces

...
auto br0
iface br0 inet static
      address ...
      netmask ...
      network ...
      broadcast ...
      gateway ...
      bridge_ports eth0
      bridge_fd 9
      bridge_hello 2
      bridge_maxage 12
      bridge_stp off

The template for the virtual machine shows:

$ sudo virsh edit virtualmachine
...
    <interface type='bridge'>
      <mac address='53:52:00:24:95:90'/>
      <source bridge='br0'/>
      <target dev='vnet0'/>
      <model type='virtio'/>
...

So when i start the virtual machine:

$ sudo virsh start virtualmachine

it shows:

$ sudo ip -6 route show

fe80::/64 dev br0 ...
fe80::/64 dev eth0 ...
fe80::/64 dev vnet0 ...

And since we did this, as suggested:

$ sudo ip -6 route del fe80::/64 dev eth0
$ sudo ip -6 route del fe80::/64 dev vnet0

everything seems to work fine. The machines are stable now for several
days.

-- 
bridge-utils ifupdown script should disable IPv6 address autoconfiguration for underlying interface
https://bugs.launchpad.net/bugs/377474
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