Guide how to renew ip address in Linux

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

$ sudo dhclient -r

Now obtain fresh IP:

$ sudo dhclient

There is no need to restart network service. Above command should work with any Linux distro such as RHEL, Fedora, CentOS, Ubuntu and others. On a related note you can also try out the following commands:

# ifdown eth0
# ifup eth0
# /etc/init.d/network restart

OR

# /etc/init.d/networking restart

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