Failing DHCP

[Monja]

> and when dhclient tries to get an address it fails repeatedly and
> eventually times out.
> 
> This is on a link where I know for certain that dhcp works (a second
> machine using FC2 can get a lease with no trouble).
> 
> Has anyone else had the same issue?

I had.
It was when my wireless interface started to work. I discovered my
hardware ethernet interfaces switched to eth1: I modified
/etc/network/interfaces adding a dhcp line with eth1 instead of eth0
(copying the lines), then with
    sudo ifup eth1
it worked.

Hope this can help :)

ciao

Monja