UDP communication with vpn client

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Hello,

I posted a question on the “microsoft.public.win32.programmer.networks” news
group.

http://msdn.microsoft.com/newsgroups/default.aspx?&lang=en&cr=US&guid=&sloc=en-us&dg=microsoft.public.win32.programmer.networks&p=1&tid=0bc088b4-ed6c-4c76-bc41-88d553b4db67

Not wanting to double post, the above link is to my original post. I was
unaware of this site before and believe I should have post here instead.

The basics of my problem are that I have an application that uses
connectionless UDP communication to communicate with other instances on a
LAN. I am attempting to use this application where one side is on a computer
connected to a LAN via a VPN connection.

UDP packets sent by the VPN client are successfully received by an instance
of the application on the LAN, but when the instance existing on the LAN
sends a UDP packet to the instance running on the VPN client machine, the
packet fails to make it.

The (ISA 2006) VPN server is set up using VPN and NAT configuration.

Can someone please advice on how to correct this problem? It seems that the
VPN server is not properly advertising the remotes IP Address to the switches
on the LAN, or some variation of this.

--
Best Regards.
.

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