Configure static IP in ubuntu system

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To configure static IP in ubuntu edit /etc/network/interfaces as follows:

   auto eth0
   iface eth0 inet static
    address 192.168.3.3
    netmask 255.255.255.0
    gateway 192.168.3.1
    dns-search example.com
    dns-nameservers 192.168.3.45 192.168.8.10

Restart using:

   systemctl restart networking

as use of /etc/init.d/networking restart is deprecated

For DNS we can also create /etc/resolvconf/resolv.conf.d/tail file with desired "resolv.conf" static contents and do

   resolvconf -u

for settings to take effect.

Refer:

• https://help.ubuntu.com/lts/serverguide/network-configuration.html
• https://askubuntu.com/questions/143819/how-do-i-configure-my-static-dns-in-interfaces

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