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Setting-IP-Address-in-Ubuntu.md

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Setting IP Address in Ubuntu

Edit /etc/network/interfaces

Example of /etc/network/interfaces:

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
    address 192.168.1.12
    netmask 255.255.255.0
    gateway 192.168.1.1

auto eth1
iface eth1 inet static
    address 192.168.2.12
    netmask 255.255.255.0

Edit /etc/hosts

Add this line, please make sure your hostname and IP are correct:

192.168.1.12 ippbx01.somedomain.lan ippbx01

Edit /etc/resolv.conf

Please make sure that the DNS address is correct, for example you may add Google's DNS:

nameserver 8.8.8.8
nameserver 8.8.4.4

If you experienced issue when SIP call initiation seems to be delayed, set the nameserver to 127.0.0.1 only and remove other nameservers.

nameserver 127.0.0.1

Restart network

service networking restart

or in some distro:

/etc/init.d/networking restart

or preferable way on Ubuntu server 14.04 and above:

ifdown eth0 && ifup eth0
ifdown eth1 && ifup eth1

Do some checking

Check IP address:

ifconfig
ifconfig eth0
ip addr
ip addr show dev eth0

Check network route:

route -n
ip route

Ping the gateway and ping Internet:

ping 192.168.1.1
ping yahoo.com