ssh.conf
# ssh -Nf tunnel - starts ssh as a background process
Host tunnel
Hostname foo.domain.no
User myusername
LocalForward 16667 irc.perl.com:6667
LocalForward 16668 eu.undernet.org:6667
# ssh bah - logs in and forward X
Host bah
Hostname bah.domain.no
User someotherusername
ForwardX11 yes