External to Internal network access

[pmahoney]

I have the following basic network set up.

Internal network (192.168.1.0)--(192.168.x.x)Safe@Office500 (81.138.1.1)--(81.138.x.x)ADSL Router--Internet



I need to be able to give access to a client application from the internet to a server application residing on one of the internal network PC,s on a specific port number via the Checkpoint firewall. I have this working already using Micro softs routing and remote access but cannot get it to work using the checkpoint.

It comes in on say 81.45.40.1 port 50987 and is nat'ed by routing and remote access to an internal address on port 4456. How can I get a similar thing to work using the Checkpoint.

Any help greatly appreciated.

[pmahoney]

I have now solved this problem.
First I created a network object representing the internal network and static nat'd this to the single public IP address.
I then created an allow and forward rule for the public IP address on a specific port number and redirected this to the required internal IP address on the required port number.
I also created an allow rule for the internal IP address to allow traffic back out for the required port(s).

Note: I had to ensure that the internal machine had the firewall IP address as its default gateway or the connection failed.