Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I know there are several tutorials on how to manually change IP settings. However, I have yet to find a solution that fits my needs. I need to be able to script something that changes the IP address settings of a host machine. I have tried /sbin/ifconfig eth0 netmask; /sbin/route add default gw

This solution works until the machine is rebooted. I have tried running the scripted solution at @reboot by crontab from root. However, the settings do not take effect. I have noticed too that /etc/network/interfaces settings do no change after making ifconfig calls.

Is there a way to change IP address settings using ifconfig so that the settings do not change on reboot?

share|improve this question

You likely have your machine set to DHCP at boot...


sudo vi /etc/sysconfig/networking-scripts/ifcfg-eth0

change BOOTPROTO to BOOTPROTO="static"

Then add in your settings... Mine looks like this:


Save and do:

sudo service network restart

Now your IP address is static and won't change after reboot.

share|improve this answer

The solution I am currently using is to put said commands in /etc/rc.local. It is tested and this option is found to work.

share|improve this answer
if anyone stumbles in here as me - on an openSuse environment this should /etc/rc.d/boot.local – Nuno Furtado Mar 31 at 12:44

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.