more than one public ip address

August 5, 2009 at 10:13:29
Specs: Windows XP
What is the common way of utilising more than one public IP address on one
internet link such as a cable link? Is it to connect the cable modem's LAN port to a
hub or a switch, then connect the devices with which I want to use the
public IP addresses into the hub or switch?

I can see this being common for home users but what about business users? Is
it the same setup or do they use special hardware?

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August 5, 2009 at 10:29:38
You use a Router with NAT. It translates the one public IP into separate private IPs. In addition, if you do not have a DHCP server then you might want to get a router that supports DHCP too so that it can assign private IPs to all of your computers.

Then you hook your HUB or Switch up to the router to connect the multiple computers and to do your ARP.

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August 5, 2009 at 11:13:42
"What is the common way of utilising more than one public IP address "

web site publishing
front end for an exchange/email server
any server/program that needs to be a host on the internet.

A home user or small office owner has no use for multiple public ips since they put the organization at more risk than being behind a firewall/router.

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August 5, 2009 at 11:47:39
Thanks for the replies ace and wanderer.

The method described by Ace would work for multiple private addresses on the LAN side of a router. I was referring specifically to multiple public addresses on the WAN side as supplied/assigned by an ISP. For example, say my ISP provides me with three static public IP addresses and I wish to have each one assigned to three different LANs or three different servers. What is the typical setup to achieve this?

As you would have realised Wanderer, I was referring to the hardware used as opposed to the software/services.

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Related Solutions

August 5, 2009 at 14:07:28
I would setup three different routers for each LAN and assign the Public IPs to each router. Then setup a Router and Firewall in front of those routers before it goes out to the ISP.

What are these servers? Do they need public facing access like a WEB or Mail Server?

If so then simply install a Switch in your DMZ and hook them into it. Then assign the public IPs to them.

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