How do I reduce the MTU on my Airport Extreme Ethernet connection?

Hi there,
Is it possible to reduce the MTU on the Ethernet connection inside the Airport Extreme Base station. I was having trouble accessing some websites, but was able to fix it on a direct ethernet connection by reducting the MTU setting to below 1500. However, when I connect wirelessly ( I have a DSL modem connected to the WAN port of an Airport Extreme Base station), I still have the same problem, but there seems to be nowhere in the Admin utility where I can reduce the MTU for the connection.
Anyone know a work around for this?
Thanks
Martin
iMac G5 Mac OS X (10.4.3) Airport Extreme

Don't know if this will help, but if you use cocktail there is a place under "Network" where you can change the mtu setting for the machine you are using. I also remember seeing some info on this in the unix support group here in the forums.
PowerMac G4 MDD 2GB Ram, 1Ghz TiBook 1GB Ram Mac OS X (10.3.9)

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