VPN with same network at both ends

[kmcvey]

I have 2 buildings both with a T1 to the internet. At my main building I have a VPN 3015 concentrator and at the remote building I have a 1721 with IPSec feature set. I want to build a tunnel between the 2 buildings for voice traffic only. The phones are located in the remote building and the phone system computers are in the main building. Currently the sites are bridged by a satellite connection so both locations are on the same network (ex. 192.168.1.0 255.255.255.0). Is it possible to leave both sites on the same network and build a VPN tunnel or do I need to assign one of the buildings to a different network? The satellites will be reconfigured to support data traffic only.

Thanks in advance.

[nihal.akbulut]

Hi,

for this kind of scenerio you have to use NAT with IPSEc. there are some examples below..

http://www.cisco.com/en/US/products/hw/vpndevc/ps2284/products_configuration_example09186a00801ae24c.shtml

http://www.cisco.com/en/US/tech/tk583/tk372/technologies_configuration_example09186a00800949f1.shtml

[kmcvey]

Thanks for the links. Now I just need to figure out how to setup a 1721 router with the right NAT statements and I should be good to go.