At the site I just started using we have 5 public IP addresses. One server is a dedicated server using http port and https port for communications to other dedicated servers but must stay within our intranet to communicate to internal server for database updates and changes. On the other hand the owner wants to bring the mail services home and start hosting our own collaboration software for better manageability, and bring our website home to manage locally. I have already established UPS system for handling power outages to rack. Problem I have is I don't know what hardware to use to combine 3 Pulbic IP to same intranet group. I am currently working on setting up a Dhcp server to handle internal IP assignements and stop using the current router/firewall as DHCP server. Is it possible to use 3 exact routers setting each with public IP address and then static IP address for LAN configuration. Each server will have the ability for http, https, ftp and I need to insure the routing will not go the wrong server. Plus I want to keep the route as fast as possible. I have thought of setting up a Linux box to handle all public IPs and routing but am concerned this will create a bottleneck in maintaining speed. Any comments or suggestions would greatly be appreciated. Thank you

If you don't need multiple IP addresses, don't use them. There is no need to "combine" them.

If you have several domains that you want to put behind a firewall - say mail.example.com, www.example.com, ftp.example.com - DNS can give them all the IP of your firewall and it can forward the correct ports to your internal servers which would have no public IP.

Another alternative is to have the servers in a DMZ, where they can be reached from the internet or from the internal network. In this case they each retain a separate public IP.

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