Static IP

General Information

Configure static IP, Mask, Gateway, and DNS.

Checklist

• Distro(s): Debian or Enterprise Linux

if possible, bring interface down first: ifdown eth0.

• Edit /etc/network/interfaces

  vim /etc/network/interfaces

• DHCP Setup Example (Default)

  auto eth0
  iface eth0 inet dhcp

• Static Setup Example

  auto eth0
  iface eth0 inet static
    address 192.168.0.100
    netmask 255.255.255.0
    gateway 192.168.0.254
    dns-nameservers 8.8.8.8 8.8.4.4

• Bring the interface up (if brought down at the start)

  ifup eth0

• Otherwise, restart to fix nameserver conflicts between dhclient and static.

  shutdown -r now

Classic and NetworkManager methods of setting IP addresses for EL distros.

Using config files and the network service.

• Edit /etc/sysconfig/network-scripts/ifcfg-eth0

  vim /etc/sysconfig/network-scripts/ifcfg-eth0

• DHCP Setup Example (Default)

  DEVICE=eth0
  ONBOOT=no (change to yes to have DHCP start automatically)
  NM_CONTROLLED=yes
  BOOTPROTO=dhcp

• Static Setup Example

  DEVICE=eth0
  ONBOOT=yes
  NM_CONTROLLED=no
  BOOTPROTO=static
  IPADDR=192.168.0.101
  NETMASK=255.255.255.0
  GATEWAY=192.168.0.254

• Edit /etc/resolv.conf

  vim /etc/resolv.conf
   
  nameserver 8.8.8.8
  nameserver 8.8.4.4

• Restart network service

  /etc/init.d/network restart

Using the NetworkManager service.

Static IP/Gateway

• Set a static IP on an existing interface (eth0)

  nmcli con mod eth0 autoconnect yes ipv4.method manual ip4 192.168.1.50/24 gw4 192.168.1.254

• Apply settings

  nmcli con up eth0

Static DNS

• Set a static DNS entry

  nmcli con mod eth0 ipv4.dns 1.1.1.1

• Apply changes

  nmcli con up eth0