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2.3.2. Configuring a Network Interface Using ip Commands

The ip utility can be used to assign IP addresses to an interface. The command takes the following form:
ip addr [ add | del ] address dev ifname

Assigning a Static Address Using ip Commands

To assign an IP address to an interface, issue a command as root as follows:
~]# ip address add dev eth0
The address assignment of a specific device can be viewed as follows:
~]# ip addr show dev eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether f0:de:f1:7b:6e:5f brd ff:ff:ff:ff:ff:ff
    inet brd scope global global eth0
       valid_lft 58682sec preferred_lft 58682sec
    inet6 fe80::f2de:f1ff:fe7b:6e5f/64 scope link 
       valid_lft forever preferred_lft forever
Further examples and command options can be found in the ip-address(8) manual page.

Configuring Multiple Addresses Using ip Commands

As the ip utility supports assigning multiple addresses to the same interface it is no longer necessary to use the alias interface method of binding multiple addresses to the same interface. The ip command to assign an address can be repeated multiple times in order to assign multiple address. For example:
~]# ip address add dev eth1
~]# ip address add dev eth1
~]# ip addr
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 52:54:00:fb:77:9e brd ff:ff:ff:ff:ff:ff
    inet scope global eth1
    inet scope global eth1
The commands for the ip utility are documented in the ip(8) manual page.


Note that ip commands given on the command line will not persist after a system restart.