IP assignments, routing and NAT

From: M. Hrabowski (mhrab_at_ira.uka.de)
Date: 02/20/04


Date: Fri, 20 Feb 2004 08:37:55 +0100

Hi ng,
 
 I want to build up a network with a set of static IP's that my provider
assigned to me. It's a 3-bit subnet of a Class C network address I presume.
So if I let out network (0), gateway (1) and broadcast address (7) there
are five IPs left (e.g. 200.100.200.2 - 200.100.200.6, netmask
255.255.255.248 ).
 
 So far so good.
 - I want to make a number of servers available to the internet using the
different static IPs. They are all connected to the other side of the
firewall and I don't want to use Port Forwarding.
 - The computer meant to be the firewall between the servers and the gateway
has only two NICs. It's not possible to extend it.
 
So I want the servers all reside in a private network (e.g. 192.168.0.0) and
make them available via the static IP's through some kind of static NAT
from the firewall/router. So f.e. all requests from the internet for
200.100.200.3 should be sent to 192.168.0.3, all requests for 200.100.200.4
should be sent to 192.168.0.4 and so on. Is such a configuration possible
(iproute2??). And if, how is such a static 1 to 1 address translation
called?

Hope someone can help me...
 
Cheers,
Max