27 Mar 12 Linksys RV042 and RV082 NAT for IPSec VPN

How to NAT internal subnet to another network on RV042/RV082 when creating an IPSec VPN?

Recently I had to work on couple of situations where customers on the other end were using Linksys RV042 and RV082 routers and we were using a Cisco 2851 router. Building a simple IPSec VPN Peer to Peer or Gateway to Gateway was not an issue. Issue was getting traffic from customers internal network to our network. We asked customer if they can NAT their internal subnet or at least one or two IP’s to another network so that the traffic being presented to our device is not their internal subnet but instead it is the other network. Note: this comes in handy when there is an issue with overlapping subnets.

Now these two Linksys models, RV042 and RV082 offer an option One to One NAT. However this option only is applicable if you want to NAT the internal host (IP) to a Public IP. It will not work if you are trying to NAT an internal subnet to another private network for the IPSec VPN.

Work around is to perform the NAT on the Cisco Router. I hope Linksys will enable that feature in later releases of the firmware but as of now it isn’t available. If any one else finds out any other information related to this I’d be happy to check it out and it would be useful to so many of us.

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