NAT'd/MASQ'd Question

Greetings, This may not be the right forum... since it is not SuSE only question ... but I would appreciate it if someone could clue me in. Anyway... I used to have a SDSL connection with /29... my ISP raised the price from $50 to over $200. So I am cancelling them once I get this other set up. I have since gotten a ADSL account for $50, but only a /30 (1 useable IP Address.) I have a home network with SuSE as firewall, inside the firewall, I have a couple of PC's, webserver and DNS. Remembering that I only have 1 IP address. What do I set up so that (from outside) if I ping a host by name, that the host machine answers the ping, DNS request, or webserver; not the firewall? Thanks Randy