[nsp] Destination NAT

[Gerald Krause]

I try to find a solution for some kind of proxy forcing environment with NAT
like this:

initial ip packet                                            generated ip packet
-----------------                                            -------------------

                                       inside        outside
192.168.0.1 -> www.foo.bar(x.x.x.x)    ----- [ROUTER] -----  192.168.0.1 -> 1.2.3.4
192.168.0.2 -> www.tofoo.bar(y.y.y.y)  ----- [ROUTER] -----  192.168.0.2 -> 1.2.3.4
192.168.0.3 -> www.footo.bar(z.z.z.z)  ----- [ROUTER] -----  192.168.0.3 -> 1.2.3.4
...
192.168.0.x -> ?.?.?.?                 ----- [ROUTER] -----  192.168.0.x -> 1.2.3.4



Or maybe with double NAT:

initial ip packet                      interim ip packet        generated ip packet
-----------------                      -----------------        -------------------

                                       inside        outside
                                       ----- [ROUTER] -----  

192.168.0.1 -> www.foo.bar(x.x.x.x)   loopback 0 -> (x.x.x.x)   loopback 0 -> 1.2.3.4
192.168.0.2 -> www.tofoo.bar(y.y.y.y) loopback 0 -> (y.y.y.y)   loopback 0 -> 1.2.3.4
...


My first thought was about creating two NAT statements...

1) 192.168.0.x -> loopback 0 overload
2) loobback 0 -> 1.2.3.4

...but after some tests I realize that this won't work.

I have search a lot of cisco doc's for such a "fixed destination address translation"
without success. Have someone out there an idea? Or is this really a very bad way?


Thx,
Gerald