Using the IP command

The command /bin/ip has been around for some time now. But people continue using the older command /sbin/ifconfig. ifconfig won't go away quickly, but its newer version, ip, is more powerful and will eventually replace it.
So here are the basics of the new ip command.

Assign a IP Address to Specific Interface:

sudo ip addr add 192.168.50.5 dev eth1 

Check an IP Address:

sudo ip addr show 

Remove an IP Address:

sudo ip addr del 192.168.50.5/24 dev eth1 

Enable Network Interface:

sudo ip link set eth1 up 

Disable Network Interface:

sudo ip link set eth1 down 

 Check Route Table:

sudo ip route show 

Add Static Route:

sudo ip route add 10.10.20.0/24 via 192.168.50.100 dev eth0 

Remove Static Route:

sudo ip route del 10.10.20.0/24 

Add Default Gateway:

sudo ip route add default via 192.168.50.100