Multiple ip addresses

Yakideo · 04-12-2010, 09:40 AM

My ISP can give me up to 5 ip addresses. Is it possible to "forward" one of them to a machine to get rid of nat? I was thinking of "forwarding" one public ip to my machine and let the rest of the network share one ip using nat.

Currently I use dnsmasq and debian.

Thanks.

jefro · 04-12-2010, 03:48 PM

It would depend on the topology of your system. If you have a public IP on any lan computer it would be easy to allow it access to and router to the internet. Simply put the ip and gateway in and go. As for topology you may have to explain so that we get the correct gateway.

nowonmai · 04-13-2010, 06:20 AM

It depends on what your router is capable of.
TBH, I would doubt it, if it's a standard consumer router.
If you set up a linux box as your router, no problem... just create the iptables rules to forward all for a given destination to whatever box you require.

cola · 04-13-2010, 06:55 AM

Quote:

Originally Posted by Yakideo

My ISP can give me up to 5 ip addresses. Is it possible to "forward" one of them to a machine to get rid of nat? I was thinking of "forwarding" one public ip to my machine and let the rest of the network share one ip using nat.

Currently I use dnsmasq and debian.

Thanks.

You may have to set up your box as a router.
Setting iptables is also needed to forward ip packets.

catkin · 04-13-2010, 07:54 AM

Quote:

Originally Posted by nowonmai

It depends on what your router is capable of.
TBH, I would doubt it, if it's a standard consumer router.

Agreed but some SOHO routers do provide a DMZ facility ... would be god to know the OP's router's make, model and firmware.

Yakideo · 04-13-2010, 09:40 AM

First of all thanks for the answers.

My router is a x86 box running iptables and debian.

The thing is that the ip addresses I receive from my isp aren't static. Dunno if there is a way to let iptables get a ip address from a dhcp and then forward it.

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cola · 04-13-2010, 10:00 AM

Quote:

Originally Posted by Yakideo

First of all thanks for the answers.

My router is a x86 box running iptables and debian.

The thing is that the ip addresses I receive from my isp aren't static. Dunno if there is a way to let iptables get a ip address from a dhcp and then forward it.

May be, ip masquerade.

Yakideo · 04-13-2010, 10:14 AM

Quote:

Originally Posted by cola

May be, ip masquerade.

That would be NATing with I already have. I would like to forward another public ip to a single computer.

I guess the question is how can I get two ip addresses on one interface?
Also see the attached picture in the previous post. It's kind of hard to explain or maybe I'm just making it hard, dunno