Routing and Remote Access
From: Paul Hadfield (paul_at_anon.com)
Date: 02/01/05
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Date: Tue, 1 Feb 2005 09:48:55 -0000
All,
How can I set up a Windows 2000 Server running Routing and Remote Access
service to be both a VPN server and implement NAT between a private network
and a public network?
For example:
We have two networks:
Net A = 172.16.0.0 mask 255.255.248.0
Net B = 192.168.2.128 mask 255.255.255.128
Our RRAS server has
NIC A = 172.16.1.1
NIC B = 192.168.2.181
Net A is considered the public network and Net B is considered the private
network.
We have quite a unique environment as we have clients on the private Net B
that fall in to two categories; 1) Net B clients that must establish a VPN
to Net A so that they have a 172.16.x.x IP address and are therefore
completely visible to network A, and 2) Net B clients that must use NAT to
be able to establish communications to any Net A server/IP, while remaing
behind NAT and as such having no route back (other than the route
established through NAT).
I have first set-up RRAS to provide the VPN functionality from Net B to Net
A and have this working perfectly. However, as soon as I install the NAT
Routing Protocol and add in both the Net A and Net B interfaces, routing
from the VPN to Net A ceases while NATing from Net B to Net A works fine.
It seems to be when I add the Net A (Public) network into NAT that the
problem occurs. As soon as I remove this single interface from NAT (leaving
the Net B interface there), NAT routing to Net A stops (as expected) and
then VPN routing to Net B resumes.
What am I doing wrong here???
Many thanks in advance for any suggestions,
Paul.
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