VPN to 2 locations with same subnet

[fathead]

I setup a new office on subnet 192.168.2.0 that will host a UNIX server and 3 Windows servers. The Windows servers are in place, but the UNIX server can not be moved for a month or so. My problem is this: I need the remote office on subnet 192.168.3.0 to connect to the Window servers at the new office over a VPN and connect to the UNIX server at the old office over a VPN, but they are both on a 192.168.2.0 subnet. I didn't change the subnet because the UNIX box was supposed to be moved with the Windows server.

I am using TZ 170's at all locations. How can I setup rounting to send UNIX traffic from the 192.168.3.0 sunbet to 192.168.2.104 (old office) and all other traffic to the new office (also 192.168.2.0 subnet)?

http://www.ics-ms.com

 

[msworld]

If both LANs are in the same IP range, the LAN to LAN VPN doesn't work. Think about this case. If you have one computer using 192.168.2.1 in office A and another computer using the same IP in the office B, the router will never send the traffic to the remote LAN. However, if they are not using the same IP address, you may try peer to peer routing or IPSec. This search result may help,

VPN using same ip in the different subnet
VPN server and client are using the same IP but in different subnets ... You may modify the routing table to make one (VPN client) to one (remote computer) ...
hppt://

http://www.chicagotech.net/Q&A/vpn38.htm

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

http://www.HowToNetworking.com

 

[fathead]

I understand how a VPN works so let me try to explain my problem better.

Office A 192.168.2.0 Windows Servers

Office B 192.168.3.0 remote office

Office C 192.168.2.0 UNIX server (temporary-will be moved in 30 days)

Office B has a VPN connection to Office A and Office C since B is a different subnet then A & C. The plan was to move the UNIX server to Office A and close Office C and solve all problems, but since I can't move the UNIX server until next month, how can I have clients at Office B (3.0 subnet) to login to windows servers at Office A, but send telnet traffic to 192.168.2.104 at office C?

I have a point to point T1 from Office B to Office A. I can setup a VPN using a TZ 170 from Office B to Office C. I know I can set a route to a specific network, but how can I set a route to a specific host(UNIX server)?

I hope this explains it better!!

http://www.ics-ms.com

 

[msworld]

That makes sense. As mentioned in my post, you may create a peer to peer routing, for example, route add 192.168.2.104 mask 255.255.255.0 192.168.3.1 (192.168.3.1 is office B gateway).

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

http://www.HowToNetworking.com

 

[gmail2]

route add 192.168.2.104 mask 255.255.255.0 192.168.3.1 (192.168.3.1 is office B gateway).

Sorry to interrupt ... but shouldn't that be route add 192.168.2.104 mask 255.255.255.255 192.168.3.1 ???

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[msworld]

Correct. Thanks.

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

http://www.HowToNetworking.com