View Full Version : [ubuntu] Multiple IP on single Nick

May 3rd, 2009, 04:56 PM
Hi folks -- looking at my firewall / router unit -- is it possible to have more than one public ip on the outside nick of the firewall and do the routing internally?


May 3rd, 2009, 05:26 PM
yes; you'd make 'aliases' such as eth0:0 and eth0:1
I think you'd do that simply be defining them in /etc/network/interfaces, or by running ifconfig as shown here (skip the part about kernel modules and assume this feature is present in your kernel)

What are you trying to do ?

May 3rd, 2009, 05:30 PM
Im kinda re-organizing our school firewall - and trying to streamline operations some -- ive had a machine thats been sitting outside the firewall totally that id like to bring back inside -- and another one id like to establish that is public facing but would be inside our network -- they each need separate public IP's. I used to be able to do it with our cisco pix, but wasnt sure about a ubuntu firewall machine.


May 3rd, 2009, 08:43 PM
sounds fun.

linux is quite capable when it comes to networking, and iptables is a great help, not only for firewalls but also fur stuff where straightforward routing doesn't cut it. There's a good chance you can pull this off.

have fun.

May 3rd, 2009, 09:56 PM

Not sure if you've had any luck with what you're trying to do but you might like to take a look at this post:


Looks like the poster's doing what you're trying to do. I wouldn't mind having a go at this myself sometime in the near future...

Good luck!