Resetting DHCP leases

lillebrorochkarlsson · 2013-11-27T14:10:54.000Z

I am changing a DHCP scope on my 2008 box and would like to have all leases reset and get IPs from a new range without having to wait until they expire which is set to “in 6 days” right now. The scope is on the same subnet, just shifted host range a bit from 100-200 to 50-150 instead. Thanks. Alex.

maxsec · 2013-11-27T14:18:19.000Z

you’ll have to wait or reboot or run a script to drop and get a new lease on each host.

I always drop the lease time down to a couple of hours a good week before I make the change

lillebrorochkarlsson · 2013-11-27T14:34:06.000Z

@Martin2012: Yeap, I figured that one out already while testing. Just thought there might be a way to not have to do it manually. Bummer! Thanks anyway.

cybersharktech · 2013-11-27T16:29:17.000Z

Last time, I used Group Policy, told everyone to relog.

lillebrorochkarlsson · 2013-11-27T16:31:04.000Z

@Practicon: explaining how you did it would be good LOL

semicolon · 2013-11-28T10:44:09.000Z

If they’re windows clients, use psexec or Powershell to run the following command on the clients:

“ipconfig /release && ipconfig /renew && ipconfig /registerdns”

The ampersands are important.