LAN-to-LAN with Overlapping networks and PAT

Discussion in 'Cisco' started by Siddhartha Jain, Mar 31, 2005.

  1. Hello,

    I am trying to get a LAN-to-LAN IPSec VPN to work.

    Site A is
    Site B is

    On Site A, the inside network accesses the internet by being PAT-ted to
    a pool of four global IP addresses -

    Site B has NAT-ted the hosts to be connected to over the VPN with

    Now my question is that how do I configure Site A router wrt to NAT.

    Will it work if I leave the PAT on Site A as it is and define my
    interesting traffic as:
    access-list 190 permit ip host

    The PAT on site A is defined as:
    ip nat pool tcsux prefix-length 29
    ip nat inside source list 163 pool tcsux overload

    On Site B, the interesting traffic would then be between and

    Will this work? Ofcourse, I can punch in the config and see if it works
    but unfortunately Site B isn't under my command so I need to suggest
    the config to the Site B admin.


    Siddhartha Jain (CISSP)
    Siddhartha Jain, Mar 31, 2005
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