Uploads freezing

That's one for a network guru…
I have a home network (airport) and two Macs (iMac, MBP).
With my MBP (and my wifes 2 Macs) everything works fine, so the problem is obviously not with my ISP.
The iMac has strange network problem:
Downloading works.
Uploads freeze if bigger than about 300kb, this means practically no mails with attachments can be sent, no uploads to iDisk or to ftp servers work.
Going to «perftest.cablecom.ch» shows that upload packets smaller than 512k work, bigger give me a timeout.
Steps I have taken to isolate the problem:
1. Started with the MBP as an external disk via target mode. Uploads keep stalling.
2. Used internet sharing on the MBP to access the internet via etehrnet cable (Airport disabled): works
3. Toyed around with Airport Base Station settings
4. Changed MTU in Airport > Ethernet to lower values (<600) and tested with perftest.cablecom.ch. Upload worked in the perftest (no timeout, fair results). Mails and other uploads still stall after some dozens of kilobytes.
5. Ran Apple hardware diagnostics tool (short test). No problems.
6. Disk Warrior reports no problems
I didn't do a fresh reinstall (as the uploads didn't work with external disk startups)
Has someone an idea what I could do?
Any help will be greatly appreciated.
David

In the meantime I have erased the hard disk and freshly reinstalled Leopard. The problem persists.
I went to a local Apple dealer and on his network everything works. The technician told me that he had had this problem at home (and has not solved it yet).
So the problem must be with my network or my Airport extreme: 3 Macs and an iPod touch have no problem receiving and sending any amount of data, but my iMacs uploads crawl to a halt after a few kb.
Great… any ideas around…?

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