Recently I converted an old MacBook into a server, running OS X 10.6.8 (the normal, non-server edition). I use it as my VPN server, my bittorrent rsync server, web server, ssh server and so forth.
Sometimes I manually disconnect the LAN cable from my server to speed up my connection for online gaming, afterwards I plug back the LAN cable.
What is a good way to temporary disable the LAN device on my MacBook running OS X 10.6.8? Preferably that it automatically enables again after a specified period of time (some sort of timer). I would prefer a method via SSH.