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its up to your ISP's logical topology that dictates your connection type, PPTP DHCP Static, PPTP etc. your lan you have control over. are you sure it is static? or does it just have a long TTL (time to live)>expiration of the current ip and renews after the TTL is up.
by default the wrt54g is set up as dhcp. if you have a username and password, you have PPPOE. if you dont have a username or password, you likely are dhcp, and or have to use whats called mac address authentication. call your isp for details on your type of service, and post back, we will help you put your info in.