Translating an IP Address again

Question

I have a question about NAT(Network Address Translation). is it possible to translate an already translated IP address? would you please guide me why it is possible or impossible?

Answer 1

You seem to be referring to Double-NAT (extract below).
Here is more local reading from ServerFault: Why is it a bad idea to use multiple NAT layers or is it?

When you have a situation where you have two subnets 
that are the same addressing that wish to communicate, it's a useful hack 
because it allows you to de-couple them into separate address space.

    ASCII Art 3: Attempt 2

            Network 1
            192.168.150.0 (Corp)
                             |
            Network 2        |
            192.168.180.0 (Intermediate)
                                    |
                    NAT BOX 1       |
                    eth0 192.168.180.180
                    eth1 10.15.15.1
                                |
                    NAT BOX 2   |
                    eth0 10.15.15.2
                    eth1 192.168.150.252
                                    |
            Newtwork 3              |
            192.168.150.0 (Untrusted Network)

That netfilter Double-NAT HOWTO goes on to discuss iptables the configuration,
Rusty's Really Quick Guide To Packet Filtering Copied.

Answer 2

Yes, it is possible to have multiple NAT layers. As long as each router points to the one "above" it as the gateway, there shouldn't be much problem for clients inside the layers to reach servers outside the layers.