Is it possible to setup and have a working NAT/PAT in your LAN?

[anthony.marsh]

I am trying to setup and test NAT/PAT within my LAN. So far I've been failing miserably. Can anyone shed some insight into how I can actually make this work, as I am struggling?

I have 4 subnets, x.x.10.0/24 is my backbone. The router has 4 interfaces to the remaining subnets. The subnet that I am attepmting to use in the NAT/PAT solution is x.x.14.0/24.

On my NATTING router, I've got a virtual IP address which NAT's to local IP on subnet x.x.14.0/24. Int Fa0/0 sits on the x.x.10.0/24 subnet and x.x.17.0/24 is a loopback interface

Protocol is RIP.

I will attach my output and config for you.

[dbellaze]

The reason it does not work is because the packet source does not enter on the loopback interface where ip nat inside is configured.

In order to go through NAT a packet must go from inside to outside, or outside to inside.

In order to get this situation working you would have to do NAT on a stick.

http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a0080094430.shtml

Daniel