VPN -- different behavior between Mac and Windows XP clients.

Hi,
Background:
I have a Mini server serving L2TP IPSEC vpn with both Mac and Windows (all XP, so far) clients.
The mini sits behind a Netopia router/firewall/NAT box that port forwards L2TP traffic to the mini.
The mini has a public but unrouted address (unrouted in the public Internet, that is.) The same Netopia serves as the router for outgoing public connections. DNS is served by other servers.
The VPN clients are distributed addresses from the unrouted public address space.
Client <-> NAT <-> Public Cloud <-> NAT <-> Private (with public addresses) <-> Mini (VPN)
Mac clients work happily, accessing internal and external hosts.
The XP clients have a registry value set to allow NAT traversal:
under HKEYLOCALMACHINE\SYSTEM\CurrentControlSet\Services\IPSec, AssumeUDPEncapsulationContextOnSendRule is set to 2 to allow dual Nat traversal.
The XP clients happily access internal hosts, but hang accessing some, but not all external hosts.
For example, most Google services are quickly displayed, whereas www.comcast.net or www.llbean.net hang. It appears to be more frequent accessing third-party hosts while processing the initial page. Some Google web services, e.g. some Google Map plugins do eventually hang.
An XP host internal to the network configured with the above registry key set to 0 (No NAT traversal)
exhibits the same behavior when using a VPN connection
Public Cloud <-> NAT <-> Private (with public addresses) <-> Mini (VPN) <-> Pvt. <-> Client
Same host without VPN works fine.
Clearing the XP checkbox that routes all traffic to the remote (VPN) router makes external hosts work
as you would expect.
So my questions are:
a) What's XP doing?
b) Can it be fixed? (besides routing public traffic away from the VPN.)
Thanks Jonathan
p.s. MrHoffman, I almost asked this in the HP Forum as well, till I noticed you were here. (Assuming you are Hoff.)

Hi soccerdude21490-
+Is this possible?+
Theoretically yes. However, it would be up to the school to allow you access through their network.
The first step would be to contact the school's IT department and ask them if they will allow such a connection, and if so, could they please provide you with the settings (ip address etc.).
Luck-
-DP

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