PfSense noobie -> multiple lan interfaces

[HaDAk]

Hello. I've got a machine with three nics and one wireless card on it.  I've got a nic dedicated to the wan, and one dedicated to the lan, but whenever i enable either the third nic or the wireless, i lose internet connectivity on all interfaces.  Somehow, I managed to get the third nic up without destroying internet on the other lan interface, but i can't figure out how to share internet on that (but create a rule where it can't touch the lan on the other nic, and it doesn't exceed 100k down, 20k up).  I'm using linksys routers on each lan interface, set to dhcp forward to the pfsense box, and they're both running dd-wrt.  Any suggestions?

[Guest]

Please use the search function.  This question has been asked and answered several times already.