Routing Multiple Inbound IP Addresses -- How?

[Janina Sajka]

OK. So, I tried this, with my correct addresses, of course. It didn't
work. 

Only one service port was showing on an nmap.

Attempts to ssh to one machine got a "refused." Attempts to go to
another just sat there with no responce. I Ctrl-C'd out.


In the iptables rules I note that there are rules to accept responses
for anything that originated on the inside. Do I maybe need similar
rules for packets that originated on the outside via these addresses? In
order that the response can be forwarded back out over the Internet?


Gregory Nowak writes:
> Ok, I think I see what you're going for.
> 
> In the below examples, I assume that you have an external ip, 1.2.3.4,
> which you want to route to 192.168.0.1, and a second external ip,
> 5.6.7.8, that you want to route to 192.168.0.2. I also assume that
> your network device connected to the dsl modem is eth0.
> 
> iptables -t nat -A PREROUTING -i eth0 --source 1.2.3.4 -j DNAT
> --to-destination 192.168.0.1
> 
> and
> 
> iptables -t nat -A PREROUTING -i eth0 --source 5.6.7.8 -j DNAT
> --to-destination 192.168.0.2
> 
> Note 1:, I know I'm using incorrect number ranges for the external ip
> addresses.
> 
> Note 2: This might have line wrapped, so be sure to check for that if
> doing cut and paste.
> 
> Note 3: I obviously haven't tested this, but it should work in theory,
> as far as I understand iptables syntax. If you get errors, let me or
> the list know, and I'll try to resolve them. Hth.
> 
> Greg