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I configured a network interface with the following commands:

ifconfig eth0 up
ip addr add 192.168.9.1/28 dev eth0
route add default gw 192.168.0.1

This works. However, when I reboot the machine I lose all the configurations made. How can I make sure this is persistent? I'm using CentOS 6.3.

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check this stackoverflow.com/questions/6016713/… – harish.venkat Dec 29 '12 at 18:18
The other (and more correct) option will be setting the corresponding values in your system configuration files. Which Linux distro are you using? (If that's Linux, of course) – Leonid Dec 29 '12 at 19:02
@harish.venkat That's the wrong way to configure things for your network. – gertvdijk Dec 29 '12 at 20:46
Are you using GUI or a CLI-only? – gertvdijk Dec 29 '12 at 20:48

1 Answer

up vote 5 down vote accepted

First of all, your given configuration of the default gateway is not valid. 192.168.0.1 is not within the network of 192.168.9.1/28. I suspect you made a typo, so I assume you meant 192.168.9.10 as the default gateway here.

Referring to the RHEL 6 Deployment Guide section 8.2 for the address and section 8.4 for routes:

  1. Create/edit a file /etc/sysconfig/network-scripts/ifcfg-eth0 containing:

    DEVICE=eth0
BOOTPROTO=none
ONBOOT=yes
NETMASK=255.255.255.240 # this is /28
IPADDR=192.168.9.1
USERCTL=no

  2. Create/edit the route configuration file /etc/sysconfig/network-scripts/route-eth0:

    default 192.168.9.10 dev eth0
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@UlrichDangel Good point. Wasn't completely awake I guess. Fixed. – gertvdijk Dec 29 '12 at 21:31
@gertvdijk got it,just provided a quick fix. – harish.venkat Dec 30 '12 at 3:46

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