How to push all the DHCP clients to renew IP?

I need to change the default gateway for all DHCP clients so I got into the scope options and changed the default gateway option. But it will take days before all the DHCP clients to get renewed and then use the new gateway. That obviously is too long. Sure I can go each computer to issue Ipconfig /renew but it is unfeasible either.

Is there a way to push and enforce the default gateway change to all clients right away?
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Thomas GrassiSystems AdministratorCommented:
Just change the lease time to the shortest time allowed

That will update the computers shortly after the lease time expired
Bryant SchaperCommented:
Ditto. Set it small, a few minutes. Then once they all renew you can put it back
David Johnson, CD, MVPOwnerCommented:
dhcp isn't a push operation but a pull operation.. changing the lease time now is too late if the gateway has to change.Only in anticipation of a possible change would one change the lease time to small values. The clients should start looking to renew at 1/2 the lease time.  The dhcp server has to receive a request first before it will respond and then the DHCP handshake starts.
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CastlewoodAuthor Commented:
David, changing the lease time now is too late... You may just answer my another confusion since after I changed the lease time only to see nothing changed in the Expired Date/Time column. So if that is too late, then what can I do now? Manually go to each computer to renew?
Thomas GrassiSystems AdministratorCommented:

What was your lease time original settings?  Say 8 hours

If you change the setting to a lower value then the computers will wait till the original lease time has expired.

If you can not wait for that time

Then yes go to the computers and manually do a ipconfig /release and ipconfig /renew

How many computers you have ?
David Johnson, CD, MVPOwnerCommented:
actually the clients will start checking the dhcp server after 1/2 of the lease time has expired.

ipconfig /release && ipconfig /renew

are your only options now.

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not sure on the size of your environment but you could turn off switch ports to cause the clients to go through the dhcp process again. or reboot the clients after hours.
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