Multiple IP addresses

AfterDark · 09-01-2002, 04:26 AM

I have ADSL and use an ADSL router connected to a hub to give Internet access for a small network. Also on the network is a webserver and mail server and I use the NAT capability of the ADSL router to direct the incoming traffic as necessary.

What I would now like to do is run two web servers and since I have more than one IP address allocated from my ISP, I would like to direct incoming traffic on one IP address to one web server and incoming traffic on another IP address to another server. As I understand it, my simple NATed ADSL router can only deal with ports and cannot separate incoming on different IP addresses.

So the question is how do I set things up? I suspect it involves a firewall, but I am not sure what a firewall does in this circumstance, nor what to look for in the technical specification for a firewall solution.

Can anyone help?

**gotissues68** · 09-07-2002, 05:23 AM

What type of ADSL modem do you have? It "might" be capable of an access control list for seperate IP's. If not you could turn the webserver into a firewall running Linux or Windows as long as it has 2 NIC's or more. Linux would allow you to have 2 NIC's and as many IP's as you wanted. Windows will require 1 NIC per IP, now some will say that isn't totally true, and its not, but I've always seen broken routes when doing multiple IP's.

Sorry for the rambling. Anyhoo post your Hardware specs, ADSL modem type and make, and what your webservers are running and perhaps we can come up with a solution for you.

09-01-2002, 04:26 AM	#1 (permalink)
AfterDark Registered User Join Date: Jul 2002 Location: London Posts: 26 OS: win98/2000	Multiple IP addresses I have ADSL and use an ADSL router connected to a hub to give Internet access for a small network. Also on the network is a webserver and mail server and I use the NAT capability of the ADSL router to direct the incoming traffic as necessary. What I would now like to do is run two web servers and since I have more than one IP address allocated from my ISP, I would like to direct incoming traffic on one IP address to one web server and incoming traffic on another IP address to another server. As I understand it, my simple NATed ADSL router can only deal with ports and cannot separate incoming on different IP addresses. So the question is how do I set things up? I suspect it involves a firewall, but I am not sure what a firewall does in this circumstance, nor what to look for in the technical specification for a firewall solution. Can anyone help?

09-07-2002, 05:23 AM	#2 (permalink)
gotissues68 Senior Member Join Date: Sep 2002 Location: Vancouver Washington, Mountain View CA and Atlanta GA you pick the week! Posts: 716 OS: Linux/FreeBSD	What type of ADSL modem do you have? It "might" be capable of an access control list for seperate IP's. If not you could turn the webserver into a firewall running Linux or Windows as long as it has 2 NIC's or more. Linux would allow you to have 2 NIC's and as many IP's as you wanted. Windows will require 1 NIC per IP, now some will say that isn't totally true, and its not, but I've always seen broken routes when doing multiple IP's. Sorry for the rambling. Anyhoo post your Hardware specs, ADSL modem type and make, and what your webservers are running and perhaps we can come up with a solution for you.