Networking notes

This is, of course, how to set IP addresses from the command-line. If I can't configure it with a CLI then I don't want to know how to do it.

How to permanently set static IP in Ubuntu

Edit the file:

 /etc/network/interfaces 

Edit the section for your primary network interface. It is probably device eth0 or eth1. Say you're on a 192.168.1.0 network and you want to set your static IP to 192.168.1.66. These values are typical.

auto eth0
iface eth0 inet static
    address 192.168.1.66
    netmask 255.255.255.0
    gateway 192.168.1.1
    broadcast 192.168.1.255

How to set static IP in RedHat

All network config files are in this directory:

 /etc/sysconfig/network-scripts

Each interface will have its own file named after the infterface:

 ifcfg-eth0
 ifcfg-eth1
 ifcfg-lo

The contents of a minimal ifcfg-eth0 file looks like this (GATEWAY may not be needed if you are just setting up a LAN between a few machines):

DEVICE=eth0
ONBOOT=yes
BOOTPROTO=static
IPADDR=10.1.0.1
NETMASK=255.255.255.0
GATEWAY=10.0.0.1

You need to restart the network system to have the new settings take effect:

 # service network restart