Airport blocking sites from me

got a strange problem. my airport is blocking some sites from me. i can reach the sites if i type in the server number, but if i enter it as alpha characters i get nothing. thought it was my hosting service, then my isp. once i disconnected airport and connected directly into the modem it all worked (and at a fast speed too). i've downloaded airport admin utility 4.2 (i'm running osx 10.5.2) and an old snow single ethernet port airport.
any clues on how i clear the dns records (or whatever) out of my airport so it doesn't block sites and slow things down for me?

Now how do I "ensure that the DNS server settings ... are equal to the ones used in the Ethernet section of my network preferences?"
If your Internet service provider (ISP) provides your IP address via DHCP, or if you choose your IP address manually, the DNS server settings for the base station are at AirPort Admin Utility for Graphite and Snow > (select base station) > Configure > (enter base station password) > Internet > "Connect Using: Ethernet" > "DNS servers:"
If your ISP provides your IP address via PPPoE, the DNS server settings for the base station are at AirPort Admin Utility for Graphite and Snow > (select base station) > Configure > (enter base station password) > Internet > "Connect Using: PPP over Ethernet (PPPoE)" > "DNS servers:"
The DNS server settings for the Mac are at System Preferences > Network > "Show: Built-in Ethernet" > "TCP/IP" > "DNS Servers:" (Caveat: I use OS 10.4, so if there is a relevant difference in OS 10.5, I apologize.)
Each of the DNS servers entered in these fields, if any, is represented by four numbers separated by dots. Since the settings on the Mac when it is wired to the modem seem to have no DNS problems, I expect that you could add, delete or change the ones in AirPort Admin Utility to match those.
Is there some sort of AirPort preference that I should trash? or repair permissions? Or some DNS memory that needs to get flushed?
Good question. I don't know all the places where DNS data are cached. I doubt that the base station itself collects any DNS hostname data, especially none that it retains if it has been powered down. If its DNS server settings are corrupted, I suppose that a hard reset of the base station should fix that. See Resetting the AirPort Base Station (Dual Ethernet).
One more question. As I open up AirPort Admin Utility 4.2.5 it tells me "A newer version (4.0.9) of base station software is available. Click upload to install it now." Should I do that? Will it work with my older base station and newer OS X?
Yes.

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