Second network card appears fried. Why and how to prevent a third? [closed]

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http://serverfault.com – So I have an old computer functioning as an OpenBSD router for my home network. I had 3 network cards, one to wired home network, one to wireless network, and one to my modem. One day, pings magically stopped working. I login to the router with ssh over my wired network.. everything appears fine. dhclient is still getting an address from the modem and everything, but ping doesn't work.. I double and triple checked my configuration for 2 days trying to figure out why. Finally, I decide to try putting in another network card. I put it in and change everything from fxp0 to rl2 and every (HowTos)