Renew DHCP lease

The -r flag explicitly releases the current lease, and once the lease has been released, the client exits. For example, open terminal application and type the command:
$ sudo dhclient -r

Now obtain fresh IP address using DHCP on Linux:
$ sudo dhclient

How can I renew or release an IP in Linux for eth0?
To renew or release an IP address for the eth0 interface, enter:
$ sudo dhclient -r eth0
$ sudo dhclient eth0