Comment 22 for bug 584048

General instability exists with this bug as well. For example, SSHing to the VM:

$ ssh root@192.168.8.166
root@192.168.8.166's password:
Linux deb64 2.6.26-2-amd64 #1 SMP Sun Jun 20 20:16:30 UTC 2010 x86_64

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Thu Jul 22 15:57:28 2010 from 192.168.8.1
deb64:~#

///////////////////////////////////////////////////////////////////////////////////////
After waiting a few minutes, and pressing "Enter"...
////////////////////////////////////////////////////////////////////////////////////

deb64:~# Write failed: Broken pipe

///////////////////////////////////////////////////////////////////////////////////////
Then, trying to re-SSH into the server...
////////////////////////////////////////////////////////////////////////////////////
$ ssh root@192.168.8.166
root@192.168.8.166's password:
Read from socket failed: Connection reset by peer
$ ssh root@192.168.8.166
ssh: connect to host 192.168.8.166 port 22: Connection refused

This is when the ARP entry changes on the firewall I'm SSHing from, and the bridge connectivity freezes, and I have to restart the VM.