L2L VPN with overlap IP Addressing!!!

Answered Question

Hi,


We would like to set up VPN tunnel with another location, but they both have same ip addressing.


For instance:


Location A: 10.1.0.0/16 (ASA firewall)


Location B: 10.1.0.0/16 (ASA firewall)


Is there any Cisco documentation I can follow??


Thanks

Correct Answer by Federico Coto F... about 7 years 4 weeks ago

Hi,


You need to do Policy NAT for the VPN traffic (NAT on both sides of the tunnel so traffic won't overlap).


You can try following the configuration from the first ASA on this link:


http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_configuration_example09186a00808c9950.shtml


The idea is to NAT the interesting traffic on both ends, and define the VPN traffic as the NATed traffic.


Hope to help.


Federico.

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Correct Answer
Federico Coto F... Thu, 02/25/2010 - 07:52
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Hi,


You need to do Policy NAT for the VPN traffic (NAT on both sides of the tunnel so traffic won't overlap).


You can try following the configuration from the first ASA on this link:


http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_configuration_example09186a00808c9950.shtml


The idea is to NAT the interesting traffic on both ends, and define the VPN traffic as the NATed traffic.


Hope to help.


Federico.

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