• Use Static IP on Ubuntu Server

    by  • November 9, 2011 • UNIX/Linux • 0 Comments

    By default, Ubuntu uses DHCP in order to get an IP address. If you need a static IP instead, you need to update your interface configuration. This is done in file /etc/network/interfaces

    By default, the contents of this file will probably look similar to this:

    # This file describes the network interfaces available on your system
    # and how to activate them. For more information, see interfaces(5).
    
    # The loopback network interface
    auto lo
    iface lo inet loopback
    
    # The primary network interface
    auto eth0
    iface eth0 inet dhcp

    Most likely, your main interface will be eth0 (or wlan0 for wireless). So if we want to assign a static IP to eth0, something as follows may work:

    # This file describes the network interfaces available on your system
    # and how to activate them. For more information, see interfaces(5).
    
    # The loopback network interface
    auto lo
    iface lo inet loopback
    
    # The primary network interface
    auto eth0
    iface eth0 inet static
        address 192.168.0.48
        netmask 255.255.255.0
        network 192.168.0.0
        broadcast 192.168.0.255
        gateway 192.168.0.1

    You would have to update this file as root user:
    sudo vi /etc/network/interfaces

    After those changes are saved you either need to:
    1) restart your server
    sudo shutdown -r now
    or
    2) restart the interface
    sudo /etc/init.d/networking restart

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