How to configure Win2k3 RAS to fix the same subnet issues with vpn?

[mmadison]

I have a scenario here that I would think would be easy to fix, but for some reason I can't find anything on it.

Problem described as:
A remote user has a subnet on their network that is 192.168.1.x The local office has the same subnet of 192.168.1.x

Of course connecting them causes an addressing conflict and can't find resources. My previous recommendation is to set the home router up with a different base ip (which in turn makes for a different subnet.. example 192.168.55.x) This fixes the issue and everythig works.

Now, imagine that same user going on the road to Hotels, Starbucks, any open access point and the same issues arise, but they obviously can't fix those networks.

In RAS on Windows 2003 Server I see you can set up a range of IPs for static issue.
So I supply a range of IPs. 192.168.47.50 - 192.168.47.100
(some arbitrary range that likely won't be issued in a generic environment)

Obviously I need a route for this. This is where I'm banging my head against the wall. How? I try a lot of variations of things I've read on the internet and nothing seems to work.

My setup. Sonicwall firewall with base ip on the internet, vpn is forwarded to my RAS server has 1 NIC.
OS Windows 2003 server SP1.


IPv4 Route Table
===========================================================================
Interface List
0x1 ........................... MS TCP Loopback interface

0x10002 ...00 53 45 00 00 00 ...... WAN (PPP/SLIP) Interface

0x10003 ...00 11 43 ed 96 c7 ...... Intel(R) PRO/1000 MT Network Connection
===========================================================================
===========================================================================
Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 192.168.1.8 192.168.1.2 1
4.243.4.95 255.255.255.255 192.168.1.8 192.168.1.2 1
24.21.59.158 255.255.255.255 192.168.1.8 192.168.1.2 1
127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1
192.168.1.0 255.255.255.0 192.168.1.2 192.168.1.2 1
192.168.1.2 255.255.255.255 127.0.0.1 127.0.0.1 1
192.168.1.255 255.255.255.255 192.168.1.2 192.168.1.2 1
192.168.47.50 255.255.255.255 127.0.0.1 127.0.0.1 50
192.168.47.51 255.255.255.255 192.168.47.50 192.168.47.50 1
224.0.0.0 240.0.0.0 192.168.1.2 192.168.1.2 1
255.255.255.255 255.255.255.255 192.168.1.2 192.168.1.2 1
Default Gateway: 192.168.1.8
===========================================================================
Persistent Routes:
None

-------------------------------
The question is, can I do what I am asking about, and if so, how? tia

 

[msworld]

you may want to create auto vpn with route command. this link may help,

Both sites use the same IP range on a VPN connection
However, it doesn't work at the owner's home computer because the computer us the same IP range as the Office IP addresses...

http://www.howtonetworking.com/casestudy/sameipvpn.htm

Bob Lin, MS-MVP, MCSE & CNE
How to Setup Windows, Network, VPN & Remote Access on

http://www.HowToNetworking.com