Problems going through a Linux gateway

Greetings,
I am using a Linux box at home to drive my DSL connection, and share it with all other machines (using Netfilter's built-in NAT abilities). It's an Ubuntu Dapper running kernel 2.6.15.
My Windows box has no problem at all and can access any web site. So does my PSP, for that matter.
On the other hand, my brand new Santa Rosa MBP can only access SOME web sites : google and a handful of others. I can also establish a stable ssh connection with a friend's server across that very same internet connection. With most sites, though, the browser starts making requests, then goes into timeout. For instance, I can't load www.apple.com : the browser's status bar (and a network traffic analyzer) show a bunch of requests, then everything freezes after requests are sent to images.apple.com.
I have the exact same symptoms under various settings :
- MacOS X wirelessly connected to the linux gateway (through a Netgear AP) - Safari and Firefox both
- MacOS X physically connected to the linux gateway (through another switch) - Safari and Firefox both
- Windows XP (Boot Camp) wirelessly connected to the linux gateway (through a Netgear AP) - Internet Explorer
Since the problem also appears when wired in, it's not a wifi problem. I've tried fooling around with the MTU (lowering it on the MBP), but no cigar.
One final word : I can access the internet just fine using my neighbour's AP, so I'm almost certain it's a compatibility problem between my MBP and the linux gateway.
Any help would be greatly appreciated!

Well I must give you credit because a lot of people don't know anything about the MTU settings. What setting is it at right now? Is it the same as your PC's?
Try firefox or Flock as an alternative web browser just for now for Diagnostic Perposes.
Otherwise, my notebook and my brothers iMac works fine through a linux gateway.

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