title: How to force ALL of the DHCP Clients to renew?
body: <p>Is there any network broadcast call or something that can force all the connected DHCP clients to renew their addresses immediately? </p>
  
  <p>And if not, why not? Surely this functionality has been desired by DHCP administrators from the date it was born. It makes changing a router address on a big network very hard without pervasive client automation.</p>