DNAT TCP 12345 -> 22

Hi,

I have servers with public IP addresses in a DMZ behind a firewall.

The firewall has two network interface, one connected to the DMZ, the 
other to the ISP router.

 From local network, I can access the server via SSH on ****t 22/TCP.

I would like to access the server from the outside on another ****t like 
12345/TCP. I try to translate the SSH ****t on the firewall with a DNAT
rule.

I have these rules :

iptables -A FORWARD -i $EXTERNAL_INTERFACE -o $INTERNAL_INTERFACE -p tcp 
--s****t $UNPRIV****TS -d $SERVER --d****t 22 -m state --state NEW -j ACCEPT

iptables -t nat -A PREROUTING -i $EXTERNAL_INTERFACE -p tcp -d $SERVER 
--d****t 12345 -j DNAT --to-destination $SERVER:22

With these rules I can access the server on ****ts 22/TCP and 12345/TCP.

How I can ensure that access will possible only on ****t 12345/TCP and 
not on ****t 22/TCP ?


Regards.
-- 
==============================================
|              FRÉDÉRIC MASSOT               |
|     http://www.juliana-multimedia.com
     |
|   mailto:frederic@[EMAIL PROTECTED]
   |
===========================Debian=GNU/Linux===


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