My Linux gateway likes to fall off the Internet occasionally. I think it’s Southwestern Bell’s fault, because it always seems to happen right after it tries to renew its DHCP lease. Rebooting fixes the problem, but I wanted a cleaner way.
Here it is. Do a tail /var/log/messages to get the PID for pumpd. [Or, better, use the command pidof [program name] –DF, 5/25/02] Do a kill -9 [PID] to eliminate the problem process. (This process tends to keep the network from restarting.) Then, do a /etc/rc.d/rc3.d/S10network restart to stop and restart the network. [Better: use /etc/init.d/network restart, which is runlevel independent and works on more than just Red Hat-derived distros. –DF, 5/25/02] Try pinging out just to make sure the Internet’s working again, and bingo. Back in business.
I don’t know that this is the best or most elegant way of doing it, but it works and it’s much faster than waiting for that old 486 clunker to do a warm boot.