iptables help

["Wei Ming Long" <WEI_Ming_Long@dsi.a-star.edu.sg>]

Hi everone,

I have a setup as shown below:

                   VNC Server 192.168.1.4
                          |
                          | --------> ssh tunnel on port 5800
                          |
                eth1= 192.168.1.2
                          |
                Linux Gateway
                          |
                 eth0=192.168.33.167
                          |
                          |
                 WindowsXP 192.168.33.164 
          

Requirement: To be able to access the VNC Server behind the Linux gateway
using the web browser on port 5800 tunneled through ssh.

I created a ssh tunnel between the VNC Server(192.168.1.4) & the Linux
Gateway(192.168.1.2) for port 5800 and the following iptables command in
Gateway:

iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j DNAT --to
192.168.1.2:5800 

When I type in http://192.168.33.167 in the browser on the WindowsXP machine,
Iwas expecting that the http request on port 80 would be redirected to port
5800 & go through the tunnel & reach the VNC Server.

But it doesn't work, what is wrong? can someone please help me with this?


Best regards
Matthew


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