HOWTO Reroute incoming traffic to port 22 of a Linux box in a Windows network

  • Thread starter Thread starter Pascal Vercammen
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Pascal Vercammen

Howto configure rerouting incoming outbound traffic to a
Linux box on the LAN using port 22 of that Linux box ?
The network architecture is as follows :
ADSL router => Windows2000 DMZ (server) (2 NICs) =>
switch : LAN

Somebody needs to connect to a Linux box socket
192.168.2.125 : 22. The router has a LAN address
192.168.1.1 The DMZ LAN interface has an IP address =
192.168.1.2 Its internal LAN interface uses 192.168.2.2
The target machine = 192.168.2.125:22
The WAN address = 80.201.246.213

Only following ports are open on the router : 20, 21, 25,
80, 110, 3389, 1723 and we do not have rights to open
additional ports.

I've added an address/port mapping on the NAT public
interface as follows : incoming/public port 20 ; private
IP = 192.168.2.125 ; outgoing/private port 22

However I cannot connect using a telnet session :
80.201.246.213 20

Therefore I started the FTP server (port 80.201.246.213
21) and reconfigured the address/port mapping for test
purposes as follows : incoming/public port 20 ; private IP
= 192.168.2.2 ; outgoing/private port 21

But there is no connection possible using telnet.
Directly connecting to 80.201.246.213 21 does not pose a
single problem.
 
If you are using NAT or ICS on the Win2000 box just go into
the configuration and setup "special port mapping" from the
external port to the internal address/port (which just happens to be
Linux.)
 
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