DHCP release

[lfaraone]

My ISP requires that I either call them to break the lease or release my IP address before changing my computer's MAC address (like plugging another computer in).

How can I tell (K|X|Ed)ubuntu to release the DHCP release when it shuts down, or does this happen automagically?

[NilsE]

DHCLIENT is the tool. In a terminal run:

sudo dhclient -r

Here is the excerpt from the man page for dhclient

The client normally doesn’t release the current lease as it is not required by the DHCP protocol. Some cable ISPs require their clients to notify the server if they wish to release an assigned IP address. The -r flag explicitly releases the current lease, and once the lease has been released, the client exits.

[lfaraone]

sudo dhclient -r

Thanks!

Ok, any way to have it do that automagically on poweroff?