Static IP

Static IP

1. In a single shell session:

   ifconfig eth0 10.100.29.91 netmask 255.255.255.0

   Or two separate commands:

   ifconfig eth0 10.100.29.91
   ifconfig eth0 netmask 255.255.255.0

2. Define gateway:

   route add default gw 10.0.0.1

Configuring IP address permanently

1. edit /etc/network/interfaces, do not touch "lo" (loopback interface is usually configured correctly), and add these lines:

   auto eth0
   iface eth0 inet static
        address 10.120.29.91
        network 10.120.29.0
        netmask 255.255.255.0
        broadcast 10.120.29.255
        gateway 10.120.29.1

2. Extra address is configured as follows:

   auto eth0:1
   iface eth0:1 inet static
        address 10.120.29.92
        network 10.120.29.0
        netmask 255.255.255.0
        broadcast 10.120.29.255

3. DHCP address is configured as follows (assume that "eth1" is another network card):

   auto eth1
   iface eth1 inet dhcp

Restarting network configuration

1. To make the configuration active, restart the network settings:

   /etc/init.d/networking restart

   1. To perform this service always during boot, it can be added to the startup services:

      update-rc.d script_name defaults

Checking network settings

1. IP address/mask, the DNS servers and the gateway are checked by these commands:

   ifconfig -a
   more /etc/resolv.conf
   ip route

2. The resolv.conf could contain DNS servers in their search order. E.g.

   nameserver 10.120.4.50
   nameserver 10.120.4.51
   nameserver 10.2.2.75
   nameserver 10.2.2.101

Links

1. http://odo.lv/Recipes/StaticIP

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