Hi
We have such this scenario. R3 is one customer (we do not have administrative access to R3).
customer clients with source of 172.16.0.1/24 want to connect to our server 2.2.2.2
There are 2 requirements :
(1) The range of 172.16.0.1/24 should be NAT to one IP address. (for instance : 192.168.200.1. we don't import customer range into our routing network.) hence source NAT with Overloading option (PAT) for Customer is needed.
(2) Customer does not route 2.2.2.2 IP address in R3. Just working with connected interface. They only know 1.1.23.2 (G0/0 of R2).
In simple terms :
{172.16.0.1 (one example of many) --> 1.1.23.2} must be changed to {192.168.200.1 --> 2.2.2.2} in router R2.
Since IP nat outside does not support Overload option, we have to change the direction of inside and outside as shown below. (customer side will be inside nat)
Source NAT will be OK in this approach.
"ip nat inside source list x pool y" that y is 192.168.200.1
Now, we need ip nat outside in order to do destination nat for customer. (1.1.23.2 to 2.2.2.2)
ip nat outside source static 2.2.2.2 1.1.23.2 ...... It does not work. if another IP like 1.1.23.10 is used, everything will be OK. But it seems outside nat doesn't work with interface due to routing problem.
I don't know if I explained it well, if yes :) Is it possible to do outside nat using interface IP address??
