Solved: Public IPs on a LAN

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durrban

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Joined
Oct 11, 2008
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Hello,

Here's my situation: I have 5 public IP Addresses, 24.149.111.143, 145, 147, 149, & 150. I'm behind a gateway (linux + pfSense) which is connected to the internet and to a switch which goes to 4 servers. I'm currently using SNAT and Port Forwarding to translate the private IP addresses (192.168.1.0/24) to the public ones and vice versa but I've recently come upon a circumstance where I need to actually statically set these computers to their public IP address. So instead of having the 192.168.1.0/24 subnet, i need a public subnet instead so I can set each computer to it's public IP. I know this is somehow possible but everytime I try it fails. I was just wondering how you guys would do this. What IP's would I set the gateway's interfaces to?
 
Joined
Aug 12, 2000
Messages
642
Ask your ISP for a separate external IP address and use the block of 5 inside your network. If you explain to them what you need they will usually allow this. All they do is add a route on their RADIUS server to your internal addresses via the external address. You will need to disable NAT. We have lots of customers who use this exact setup and some for the exact same reason as you. They will probably charge you though.
 
Joined
Aug 12, 2000
Messages
642
Just remember to remove the port forwarding and get some access-lists in place to protect those inside hosts. Also, if this is a business setup you need to consider your mail MX records, as they will need to point to an internal address rather than be port forwarded.
 
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