Date: Sat, 17 Aug 2002 00:25:10 -0700 From: Jim Geovedi <negative@magnesium.net> To: Grant Cooper <grant.cooper@nucleus.com> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: firewall,apache,qmail - IP Address's Message-ID: <20020817072510.GA5026@TOXIC.MAGNESIUM.NET> In-Reply-To: <056501c245b9$e51d3c80$2afececd@TCOOPER> References: <056501c245b9$e51d3c80$2afececd@TCOOPER>
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> I just acquired a new box and don't know the best way of doing this. I
> originally planned on having my box connected to the internet my web server
> / firewall / natd connected to my mail box. Can I forward tcp packets based
> on Port numbers to a specific box so I don't have to buy another ip address?
> Or does anyone have a better idea based on one ip?
>
Yes, you can do such a Port Mapping and Redirection, which mean specific port
on the external interface mapped to services inside your private network.
For example: 207.154.X.X doesn not actually have any services (except NAT)
running on it. But its mapped the request on specific ports to another box
behind it.
WWW Server Mail Server
| 192.168.1.2:80 | 192.168.1.3:25
| 192.168.1.2:21 | 192.168.1.3:110
| |
+-----------------------+---------------+
|
| 192.168.1.1
Firewall/Gateway
| 207.154.X.X:21
| 207.154.X.X:25
| 207.154.X.X:80
| 207.154.X.X:110
|
Internet
The request made to 207.154.X.X:110 are mapped to the WWW server on
192.168.1.3, if you have highload traffic request, it is possible to have
several servers in your network, with NAT router balancing to load between.
I found a good article about NAT, "Multiple webservers behind one IP
address", http://www.daemonnews.org/200202/multiweb.html
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