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Case Study – peer to peer route via VPN connection

Situation: I am studying in the Northbrook Library in Illinois while I am waiting for my daughter who is doing her project. When I read a book about how to check the Cisco NAT settings command line (show ip nat trans), I can’t wait to test it. So I accessing my office using Cisco VPN. It establishes the VPN successfully, but I can’t access any remote resources.

Problem: The ipconfig displays (see below) the library and my office use the same IP range, 10.0.0.x even they are different subnet (the library is 10.0.0.0/255.255.255.128 while my office is 10.0.0.0/255.255.0.0). The problem is the route points to the local network when I try to access the remote network because the default gateway is 10.0.0.10 (the library router). 

        Connection-specific DNS Suffix  . : northbrook.lib.il.us

        IP Address. . . . . . . . . . . . : 10.0.0.46

        Subnet Mask . . . . . . . . . . . : 255.255.255.128

        Default Gateway . . . . . . . . . : 10.0.0.10

Ethernet adapter Local Area Connection 2:

        Connection-specific DNS Suffix  . : chicagotech.net

        IP Address. . . . . . . . . . . . : 192.168.254.3

        Subnet Mask . . . . . . . . . . . : 255.255.255.0

        Default Gateway . . . . . . . . . :

Note: my Cisco PIX 515E VPN uses 192.168.254.0/255.255.255.0. that is OK and I should be able to any remote resources if they are not the same IP range.

Resolution: have seen many cases like this one, I know it should work if I can add a peer to peer route to point to my workstation in the office. Bingo! I can access my computer in the office after adding the peer to peer route as follow.

C:\Documents and Settings\blin>route add 10.0.0.11 mask 255.255.255.255 192.168.254.3.

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