Comments on: FreeBSD IP Alias: Setup 2 or More IP address on One NIC

By: Bill

Bill — Wed, 18 Jan 2012 18:49:50 +0000

Thanks for the helpful tutorial. One addition: the alias numbers must start at 0 and be consecutive numbers. If you skip a number FreeBSD will stop at the last consecutive number.

By: Gregory

Gregory — Tue, 08 Feb 2011 22:05:36 +0000

Thank you very much for posting these instructions! Highly appreciated
Gregory, ART by LENA

By: shadowbq

shadowbq — Tue, 23 Nov 2010 15:23:12 +0000

“ifconfig_lnc0_alias0=”192.168.1.5 netmask 255.255.255.255″”

should read

ifconfig_lnc0_alias0=”inet 192.168.1.5 netmask 255.255.255.255″

By: Jim

Jim — Sun, 06 Sep 2009 17:09:04 +0000

Thank you for the excellent instructions.

By: nabi

nabi — Thu, 16 Jul 2009 11:02:16 +0000

ihave working same time two ip in one nic card

By: Rooger

Rooger — Tue, 14 Jul 2009 13:59:12 +0000

Good, informative article,
Poor RAJU. hehehehehe

rooger

By: samuel

samuel — Mon, 25 May 2009 14:14:32 +0000

the ip route, i apparently find out the reason, just to force the traffic to use this specific IP source to reach this public host. But what about the remote arp static? the only time i can see this kind of arp, it’s when we have proxy arp enabled on the router, and we want to play with the same IP subnet public or private through this one.

By: samuel

samuel — Mon, 25 May 2009 14:09:23 +0000

Folks,

I’ve a question regarding the IP alias. One of customer uses a Server with many IP aliases. When they intitiate a ping or other, TCP test applicatiom this server, @IP source is not the same all the time. It means it can be one of these IP Aliases!

To fix this issue, they’ve added a static IP route to a specific IP Public IP host and an arp static between this remote host and the route’s local mac. To recap:

Server1—-RTR—Internet

IPs ser1: 1.1.1.1,.1.1.1.2,.1.1.1.3 (/24)
Rtr IP: 1.1.1.4/24

Internet Host: x.x.x..x/32 (any Public IP)

We need to open up a connection to this host using the same IP source (on the rtr, we just have a specific nat rule for this IP source, let;s say 1.1.1.2)

But it doesn’t work cause sometime, Source IP is 1.1.1.1 or 1.1.1.3…

so My customer added the following settings to reach x.x.x.x/32

arp -s x.x.x.x/32 rtr’s mac
and
static route x.x.x.x/32 trough 1.1.1.2 (local IP)

I really need some explanation. When we remove the arp, it does’nt work anymore.

IP Routing works welll.

tks a lot
I appreciate
Sam

By: schursin

schursin — Thu, 21 May 2009 13:50:34 +0000

Tnx, really helped me out!

By: bob

bob — Tue, 03 Feb 2009 23:27:32 +0000

You can definitely have two IP’s from multiple subnet’s on one NIC as long as they are both within the same layer 3 network..

By: andrew caluyo

andrew caluyo — Thu, 29 Jan 2009 08:08:42 +0000

Hi, i was just wondering… i know that it is possible to have i.p. address in one nic but the question is, is it possible to have two i.p address but two different subnet(s) in one nic? i’d like to setup an alias outside the range of the subnet of the parent i.p. I’ve read in other forums that you should have the subnet for both i.p’s but is there any other way to do this? hope you can help me with the problem. tnx!

By: Mark

Mark — Fri, 02 Jan 2009 23:12:00 +0000

Great Article, thanks, really helped me out!

By: vivek

vivek — Sat, 03 May 2008 11:33:25 +0000

Raju,

This is tutorial about FreeBSD and not about Red Hat Linux. Your instructions only applies to Linux and not to FreeBSD.

By: Raju

Raju — Sat, 03 May 2008 11:02:11 +0000

Hi,1st 0f all u r explaining 2 ip alias nd this proccess is very lenthy .i create 2 multiple NIC alaises like this;:-go t 1st network-scripts nd type dis command “cp ifcfg-eth0 ifcfg-eth0:1″.
nd put in ur ip nd netmask as u like.very easy process.u can tell me where m i wrong nd ur daily blog reader.
Regards
Raju Dutta Tiwari

By: girish

girish — Wed, 26 Dec 2007 08:23:38 +0000

i want to configure in one networkcard 2 ip adress