I'm running FC4 on an IBM Thinkpad T42. It has an ethernet interface and a wireless interface. By default, the ethernet interface is what I use 90% of the time. However, I do occasionally connect to the wireless network at my office. Here's the problem:
When I shut down the ethernet interface (ifdown eth0) and then bring up the wireless interface (ifup eth1), dhclient is not updating the name servers in my resolv.conf file, so I can't resolve anything. I have connectivity and I receive an ip via dhcp, but I can only connect if I specify ip addresses. Both cards are configured to receive DNS information via DHCP, and as I said, I am being assigned an ip on the wireless network, but it won't automatically update resolv.conf with the wireless network name servers.
At first, I thought this was great because I didn't have the problem I see so many people complain about that they can't keep their resolv.conf settings from changing at reboot. Now, however, I'm realizing it's not as great as I thought. Any ideas?