How do I set up Cisco 1600 nat port range for pasv ftp?

I would like to set up my cisco 1600 to support PASV ftp for a particular ip address using NAT.

In other words I would like to forward packets incoming to ip ports 5500 to 5700. The port range is what I have my ftp server set up to use, I think it defaults to 1024+.

Internal FTP server: ip ports 21, 5500-5700 external ip address: (for the sake of this question)

I set up the NAT ftp control port 21 (which works fine) with:

ip nat inside source static tcp 21 21

But to support passive ftp (PASV) I need to also accept incoming traffic to ports 5500-5700. This is because the ftp server will give the ftp client a random node in that range to connect to for data transmission.

I would like to do something like the following, but the cisco router doesn't like the port range syntax:

ip nat inside source static tcp 5500-5700 5500-5700

The above line DOES NOT WORK as it is an invalid format, but I think it give the gist of what I would like the end result to be.

Is there another way to do this? I'm not a cisco router expert so my knowledge doesn't go much further than setting up "ip nat inside..." commands.

Thank you, Johnny

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Not sure how to configure the 1600 to do port forwarding for that range of ports but that's not your only problem. Not only does the FTP server pass the client a randowm port number for the data connection but it also passes its IP address (the internal address) so the client will be sending packets to the address. If your FTP server supports PASV mode you'll need to configure it to use the external IP address of the NAT'ing machine and not it's own private IP address when it responds to the PASV command.

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