+Host rietz.debian.org
+ IdentityFile ~/.ssh/identity_debian
+ UserKnownHostsFile ~/.ssh/known_hosts_debian
+ ProxyCommand sh -c 'if [ $(hostname) == "archimedes" ]; then nc rietz.debian.org 22 2>/dev/null; else ssh archimedes.ucr.edu nc rietz.debian.org 22 2>/dev/null; fi;'