Multiple IP Addresses

mikemrh9 · 12-01-2004, 07:59 AM

Hi.

I'm running SuSE 9.1 Pro and would like to permanently bind 2 static IP addresses to the same network card.

I can temporarily give myself a second address with:

ifconfig eth0:1 x.x.x.x netmask x.x.x.x

How do I make this permanent? I've had a look in /etc/sysconfig/network and the configuration file for my card is called: ifcfg-eth-id-00:d0:59:36:4a:39

It contains the following:

BOOTPROTO='static'
BROADCAST='76.255.255.255'
IPADDR='76.168.1.252'
MTU=''
NETMASK='255.0.0.0'
NETWORK='76.0.0.0'
REMOTE_IPADDR=''
STARTMODE='onboot'
UNIQUE='WL76.x+4TzbL0KL6'
_nm_name='bus-pci-0000:00:09.0'

I feel that I'm almost there - just searching for the missing link...

Do I edit this file in some way, or make a duplicate file called ifcfg-eth-id-00:d0:59:36:4a:39:1 and edit the address in the new file? If so, what does UNIQUE='WL76.x+4TzbL0KL6' do, and does it matter that it would no longer be unique?

Or is there a file somewhere that I can just add: ifconfig eth0:1 x.x.x.x netmask x.x.x.x to?

Mike.

ror · 12-01-2004, 08:03 AM

try /etc/rc.d/rc.inet1.conf (iirc, that's from memory, it's something around there tho )

bathory · 12-01-2004, 08:17 AM

You can create a script with the following 2 lines:

Code:

#! /bin/sh
ifconfig eth0:1 x.x.x.x netmask x.x.x.x

Copy it to /etc/init.d, make it executable and create a symlink for runlevel 5:

Code:

ln -s /etc/init.d/script /etc/init.d/rc5.d/S99script

mikemrh9 · 12-01-2004, 08:56 AM

Thanks to both of you for your help.

I tried bathory's solution and it worked fine.

I thought I'd got symlinks under control, but there is obviously more to them than meets the eye!

What is the significance of the first 3 characters, ie S99, K08 etc?

I've looked in the man pages, and also in info coreutils ln, but found no reference to these characters.

Mike.

bathory · 12-01-2004, 09:21 AM

S is for start a service (through the script) and K for stopping it when you enter-exit that runlevel. The number is for the order the scripts are executed. Greater numbers mean latest execution. So S99 is the last script to run when you you enter that runlevel.

mikemrh9 · 12-01-2004, 09:29 AM

Brilliant.

Thanks!

mikemrh9 · 05-26-2005, 05:15 AM

While this is an excellent way to inadvertently learn about the init.d process, there is another, simpler solution to configuring multiple addresses.

Instructions can be found in /etc/sysconfig/network/ifcfg.template

The only slight caveot is that after doing this, the new addresses are not displayed by 'ifconfig'. however, you can use 'ip ethx' instead.