How can I renew or release an IP in Linux?

IP Release : ifconfig eth0 down IP renew : ifconfig eth0 up For DHCP Connection dhclient eth0

To renew or release an IP address for the eth0 interface, enter: $ sudo dhclient -r eth0 $ sud dhclient eth0

Go through below simple commands to renew (restart, or reflush) the ethernet connection, that will result in the renewing of DHPC IP. Assuming your network connection is eth0 (you can check it with ifconfig command):#ifdown eth0#ifup eth0OR#ifconfig eth0 down#ifconfig eth0 upIf you set up static DHCP assignments and then needed to switch over to DHCP.#dhclient -r; dhclient

How to Release and Renew IP address in Linux? Follow the below given procedure: 1. Go to the terminal. 2. Type the command " ifconfig ". This command will list the IP assigned to your computer. If the computer is holding an IP address and you need to release it. Issue the following command. 

Code: ifconfig eth0 down

*Note: You need to have root previlage to run this command. To obtain a new IP address, type the following command. 

Code: ifconfig eth0 up

the above answer is the way to go, but that's only if you're running it on your console.
if you're working remotely, and you're trying to change your IPs you'll get kicked out before getting your interface back up.
go for: ifconfig ethN down && ifconfig ethN up #where N is the interface nic in question.
OR dhclient ethN #as previously mentioned which is the safest bet to go