Comment 6 for bug 312157

I have a slightly different problem with dhcp after upgrading from 8.10 to 9.04 yesterday.

After boot using the default kernel there is no wired connection to the internet, but everything on the local network is available. (ping by name to local machines works, but pop for email fails.)
If I did not have another machine on the local network, I would have had no way to know how to fix this, as this isolates the upgraded machine from the internet.

I can always correct this by doing:

sudo ifdown eth0
sudo ifup eth0

Since this is repeatable, I'd like to hunt it down to the source of the problem, but I have no idea how to proceed.

The network icon in the system tray does not show an active network (neither wired nor wireless) before and after the ifdown/ifup fix.

Any suggestions as to what I could do to fix this?