title: Does DHCP client receive DHCP NAK if any of the parameters are wrong in DHCP Release?
body: <p>I am building a dhcp client using C on Ubuntu 9.04. Now I send a dhcp release to the dhcp server, it sends no ack as expected. I was wondering if it sends any DHCP NAK if any of the parameters are wrong.</p>
  
  <p>There is one more problem. After sending DHCP Release my internet is still working. Also when I do ifconfig it still shows the ip address of eth0.
  But when I do dhclient -r internet does not work and ifconfig does not show the ip address of eth0.</p>