Can't open FTP data connection

From: nhatphuc (nhatphuc@gmail.com)
Date: Tue Jan 22 2008 - 15:23:46 ARST

Hi Group

I want to nat an FTP server in my inside network.

If I nat like this:

ip nat inside source static tcp 192.168.1.2 20 interface Dialer1 20
ip nat inside source static tcp 192.168.1.2 21 interface Dialer1 21

Everything works well

But If I nat to port 210 on the outside, it doesn't work:

ip nat inside source static tcp 192.168.1.2 20 interface Dialer1 20
ip nat inside source static tcp 192.168.1.2 21 interface Dialer1 210

Total commander stops responding when downloading file list. FTP Server says
it couldn't connect to peer, client says can't open data connection. I'm
using active FTP.

Why is it so? And how do I fix it?

Thanks

Phuc

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