Nortel VPN still broken with Airport Extreme firmware 7.1

I've just recently started using the NAT'ed mode of my 802.11n Airport Extreme and the the Nortel VPN connectivity is still broken with firmware 7.1.
I've setup a side by side config using the new Airport Extreme and my older Airport Express to make sure the issue is indeed with the Airport Extreme.
Here are the details of my setup:
ISP: NTT/GOL B-FLET (PPoE)
Wireless Config #1 - Airport Extreme firmware 7.1
Wireless Config #2 - Airport Express firmware 6.3
Client #1 - Nortel Contivity VPN V06_01.014 Windows XP 802.11g
Client #2 - Nortel Contivity VPN V04_86.033 Windows XP in Parallels 802.11n
The odd thing is that it isn't totally broken. The VPN connection is made and low bandwidth transfers work fine (ie. ssh, http requests), but higher bandwidth transfer fail to complete (ie RDP/RDC, ftp's, Outlook xfers).
When my clients are on the Airport Extreme Network, they have the issue but don't have the issue on the Airport Express network.
Is anyone else still having problems with Nortel VPN ? Does Apple have any suggestions ?
Thanks,
Eliot

I'm using Apani's Nortel VPN client (the most recent version) on my Mac mini, and the Windows version on my Windows XP notebook computer. Both were broken with the original AEBS firmware (7.0), but now both work well with the updated 7.1 firmware.
Keep experimenting - I'm sure you'll get it working.

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