multiple public ip one server

frieza · 03-05-2010, 04:13 PM

forgive if this has been asked before but say i have a commercial ISP connection with 5 IP addresses available and i want the following configuration
note when i say domain group i am refering to a group of top level domains (not subdomains) owned by the same entity (company) with their A records pointed at the same public IP
for a single server

Code:

domain group 1 -> x.x.x.1 \
domain group 2 -> x.x.x.2  \
domain group 3 -> x.x.x.3   > y.y.y.1
domain group 4 -> x.x.x.4  /
domain group 5 -> x.x.x.5 /

or
for a server farm

Code:

domain group 1 -> x.x.x.1 \__y.y.y.1
domain group 2 -> x.x.x.2 /
domain group 3 -> x.x.x.3 \__y.y.y.2
domain group 4 -> x.x.x.4 /
domain group 5 -> x.x.x.5 ___y.y.y.3

can this be done with say a cisco router with one wan port and a switch on the internal network? if not can it be done with a linux box and iptables/ipchains?

acid_kewpie · 03-05-2010, 04:37 PM

Youre pretty vague on how you actually want this to work. Nice diagrams don't make a good description unnecessary. But, yeah, it looks like you just want a nat, nothing "interesting" at all to be honest, if I read it right. It's certainly strange to deliberately make your DNS records overly complicated and then have to put in more work on the nat side. If you only have one internal server, why bother with 5 public IP's in the DNS? How are you any better off from doing that? Under IOS it certainly makes the NAT more complex as you can just use a single static NAT otherwise.

Check part 3 here http://www.cisco-tips.com/configurin...o-ios-routers/

frieza · 03-05-2010, 04:41 PM

ok sorry what i mean is
a router that can respond to multiple IP addresses on it's WAN port and map it to a smaller subset of IP addresses inside the network based on which external ip is requested as opposed to having one router for each public ip addr

i would presume this would be a commercial grade router as opposed to one picked up at wal-mart?

or a dual nic linux box with iptables?
perhaps you could point me in the direction of some documentation on how to set up such a NAT?
i'm not in a huge rush but i am going to need this information relatively soon

acid_kewpie · 03-05-2010, 04:45 PM

check my edits in my first reply.