Bidirectional nating using an Windows server

Yes. man IP Routing man Routing Service man RAS Routing

For some more serious implementation, you might take a look at M$' ISA Server or Kerio WinRoute.

A Microsoft tech told me that M$ ISA Server doesn't support bidirectional nating. At first glance Kerio WinRoute doesn't seem to do it either.

What we got now. Computer Network 1 Network 2 A 10.0.0.1 Proxy 192.168.0.1 B 10.0.0.2 Proxy 192.168.0.1

What we want. Computer Network 1 Network 2 A 10.0.0.1 Bi-direct. nating

192.168.0.1 B 10.0.0.2 Bi-direct. nating 192.168.1.5

This is exactly want bidirectional nating do versus overloading nating.

Something like that but Windows favor.

Bidirectional Mapping (1:1 mapping) A bidirectional mapping can be established by using the binat rule. A binat rule establishes a one to one mapping between an internal IP address and an external address. This can be useful, for example, to provide a web server on the internal network with its own external IP address. Connections from the Internet to the external address will be translated to the internal address and connections from the web server (such as DNS requests) will be translated to the external address. TCP and UDP ports are never modified with binat rules as they are with nat rules.

Example:

web_serv_int = "192.168.1.100" web_serv_ext = "24.5.0.6"

binat on tl0 from $web_serv_int to any -> $web_serv_ext

Source:

What do you mean by "nating"? NAT? What is "bidirectional NATing"?

Yours, VB.

Ah - you mean static NAT.

Windows 2003:

ISA:

Yours, VB.