how to get dhclient to reconfigure link?

[Joe Smith]

I had to unplug my network connection (FC5; single PC-cable modem) for a 
couple of hours today, and when I plugged it back in, the kernel 
recognized that the link was up again, but the dhcp client did not 
reconfigure the link. I tried ifconfig eth0 down/up--no change. I 
finally just killed and re-started dhclient, which worked but seems 
pretty clunky. What's the recommended solution?

<Joe