port forwarding on this setup: Prolink 5200 modem/router connected to Linksys BEFSR41 v4.2

port forwarding on this setup: Prolink 5200 modem/router connected to Linksys BEFSR41 v4.2

I'm using Mac OS X 10.6 on a 2006 Macbook. We recently switched ISPs and our new ISP gave us a Prolink 5200 Hurricane modem/router. We have another computer in the house but the 5200 only has one port, so we connected it to a Linksys BEFSR41 v4.2 4-port (wired) router.