Hello all,

I have a debian 6 machine with two network interfaces:

eth0 with IP: 192.168.1.1
eth1 with IP: 10.0.0.1

On 10.0.0.1 on port 80 a server program is listening, but NOT on 192.168.1.1.
But I am connected to eth0 and I have an IP like 192.168.1.2.

How can I forward (route) port 80 on eth0 to eth1, possibly using NAT, so that I can connect to the server program listening on 10.0.0.1.

I cannot modify the server program nor anything physically on the server.

Thank you

Andreas

First, your client (192.168.1.2) must know that network 10.0.0.0/?? is accessible through the host, in it's broadcast domain, 192.168.1.1:
If the client is linux:
route add -net 10.0.0.0 netmask 255.255.255.0 gw 192.168.1.1
If the client is windows:
ROUTE ADD 10.0.0.0 MASK 255.255.255.0 192.168.1.1
(I'm assuming the 10.0.0.0 network is a /24, adjust the netmask as necessary)

You don't need NAT and you shouldn't need to forward since the server is running on the gateway/router.

You also shouldn't need to define the reverse route since the server's routing table should already have the information it needs (network 192.168.1.0/24 can be reached through interface eth0).

If the machine is the gateway/router he does not even need the route to 10.0.0.0/24 as long as the default gateway is 192.168.1.1.

You could also make the webserver listen at all devices on the gateway.

Doing it with NAT you would use DNAT so that everything on port 80 to 192.168.1.1 is forwarded to 10.0.0.1

this seems related:
http://www.linuxquestions.org/questi...6/#post3804866