the situation is like this: We have a big Pool of public IP-Adresses.
Let's say from x.x.100.x to x.x.150.x
Our DNS-Server is sending all requests from x.x.116.x-Net to the IP-Adress: x.x.125.11
On this IP-Adress (x.x.125.11) there is running an old Debian Linux Router with 2 Network Interfaces.
On Network interface is of course connected with the IP-Adress x.x.125.11
The other network interface is connected with the IP-Adress x.x.116.22
Both IP-Adresses can be reached from outside our company by internet.
The Debian Router is now working as Gateway for the x.x.116.x - Net and all Servers in this subnet
have now public IP-Adresses, for example: x.x.116.10, x.x.116.11, x.x.116.12, x.x.116.65, and so on.
All servers can be reached from outside our company by internet, because all IP-Adresses are public.
The Problem is: I have to install and configure a new linux machine with Debian/Ubuntu (the debian machine is very old now, about 4 years I think) Linux, but I have no idea how to do this, because all instructions i found in the internet are explaining how to setup a linux as router in home office with 1 public IP-Adress.
Maybe there is also the possibility to make this routing with a linux firewall like smoothwall, IP-Cop or Endian Firewall. I have tried already with Endian Firewall, but with no success.
Thank You for your answers and your help.