Loopback adapter changes lost

joel_eire · 10-18-2009, 10:23 AM

Hi,

I'm running Red Hat Enterprise 5.1

I need to add the following to my network config:

ip address add 192.168.99.37/24 dev lo

This works fine but my issue is that if "service network restart" is run this config is lost and I have to manually re-run it.
I have added it in rc.local which covers me for reboots.

so, What the best way to make this command run in the network restart?

Thanks guys

Joel

r3sistance · 10-18-2009, 03:05 PM

You should leave lo at 127.0.0.1, it can cause issues to change it like that.

Anyways there is a configuration file what is /etc/sysconfig/network-scripts/ifcfg-lo where you can change the default ip.

However I would suggest the following, copy the ifcfg-lo file to the file name ifcfg-lo:0 (within the /etc/sysconfig/network-scripts/ folder).

edit the ifcfg-lo:0 file to the following

Code:

DEVICE=lo:0
IPADDR=192.168.88.37
NETMASK=255.255.255.0
NETWORK=192.168.88.0
BROADCAST=192.168.88.255
ONBOOT=yes
NAME=loopback

This should set your machine up in a much better configuration.

joel_eire · 10-20-2009, 09:19 AM

Quote:

Originally Posted by r3sistance

You should leave lo at 127.0.0.1, it can cause issues to change it like that.

Hi r3sistance,

Thanks for the reply.
I need to create an additional ip on the loopback.
Do you know if that's possible from ifcfg-lo?

Thanks

Joel

r3sistance · 10-20-2009, 04:48 PM

As I said previously

.

Quote:

Originally Posted by r3sistance

However I would suggest the following, copy the ifcfg-lo file to the file name ifcfg-lo:0 (within the /etc/sysconfig/network-scripts/ folder).

edit the ifcfg-lo:0 file to the following

Code:

DEVICE=lo:0
IPADDR=192.168.88.37
NETMASK=255.255.255.0
NETWORK=192.168.88.0
BROADCAST=192.168.88.255
ONBOOT=yes
NAME=loopback

This should set your machine up in a much better configuration.

This will give you a new network device what is called lo:0 that will hold the additional IP.

joel_eire · 10-30-2009, 09:58 AM

Quote:

Originally Posted by r3sistance

As I said previously

.

This will give you a new network device what is called lo:0 that will hold the additional IP.

thanks for the advice, but that seemed to cause network connection issues on eth0.

Joel

r3sistance · 10-30-2009, 01:41 PM

Are you certain what you have is a direct copy of what I placed above...

if it is then might be worth checking what IP range eth0 is using.