Originally Posted by mharrison
Well he did say the router was issueing the IP. But the airport is a different piece of hardware which obviously also has the same capability of issueing IPs (we didn't touch the actual router). What he was saying was that he got the airport to issue it's own IP instead of getting it from the router.
! The key difference in your setup is that you have both
a wired router and an AirPort. This is a fairly unusual configuration, and you're right, you may need to change some settings for this to work properly. Ironically, you ideally want to ask the AirPort not
to assign IPs itself, instead letting the router do this. That's known as "bridge mode". The fact he got it to work with the AirPort issuing IPs means there was some other configuration issue, and he sidestepped it by essentially setting up two routers with their own IP addressing.
In any case, most people actually have either an AirPort, a wired router, or
a combo wired-wireless router (like the Linksys WRT54G). That makes the setup much simpler. In any case, I think the original poster is not having the same issue.