Comment 6 for bug 430820

Colin, for me on jaunty, the following /etc/network/interfaces result in a system with broken network (ie, cannot ping or connect to anything):

-------------------------------------------
# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet dhcp

auto br0
iface br0 inet dhcp
 bridge_ports eth0
-------------------------------------------

However, the following works perfectly well:

-------------------------------------------
# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet manual

auto br0
iface br0 inet dhcp
 bridge_ports eth0
-------------------------------------------

Hence, I assume having a bridge *an* one of its member interface configured for DHCP result in broken networking. Maybe I am not correct, or the behavior is different in karmic.

Attached is the output of "ip addr show" and "ip route show" with the first network config. You can see there are two default routes, etc.