How to renew your dhcp lease in linux

root@client:~# dhclient eth0
There is already a pid file /var/run/ with pid 4478
killed old client process, removed PID file
Internet Systems Consortium DHCP Client V3.0.6
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Listening on LPF/eth0/00:22:cb:ze:95:sh
Sending on   LPF/eth0/00:22:cb:ze:95:sh
Sending on   Socket/fallback
DHCPREQUEST of on eth0 to port 67
DHCPACK of from
bound to — renewal in 284384 seconds.

You could want to restart your leas for a variety of reasons.  You just set up a static DHCP lease and you want to computer to pick up the new ip.  If you are logged in via SSH make sure when you connection is dropped that you know what the new ip will be before hand or at least have a log in to the router so you can find out what it was assigned.