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DHCP Question

Posted on 2011-03-10
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Last Modified: 2012-05-11
Hi Experts
All my Clients that are on DHCP obtain a lease that is set to expire after the standard 8days

If i delete my leases from the DHCP scope which are currently in use. Then disable that DHCP scope and unauthorise the server will the clients not look for a new ip address until either a reboot or the 8days has expired. So any computer left on even though the scope has changed does the client still keep it's address?

So what i am asking is does DHCP comunciate with it's clients if it changes and update. I predict the client just gets an IP and then forgets about it until a reboot or a ipconfig /renew etc.
 
I am planning on turning off my current DHCP server and going to a new DHCP server.
But want to ensure if a computer does not turn off overnight it wont have an ip address that technically could be given out again on the new DHCP server.

Thanks
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Question by:flowit
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3 Comments
 
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Expert Comment

by:Brian Pringle
ID: 35094705
The workstations will retain their current assigned IP address until they are shut off or until something else triggers a renewal of the IP address.

The bigger concern will be that you could end up with two computers with the same IP address if one renews it address.  
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Author Comment

by:flowit
ID: 35094868
What do you mean by  "something else triggers a renewal of the IP address".

So DHCP is not clever enough to communicate with it's clients and update it's lease expired time etc?

Did not think so. It just assigns IP's on bootup or renewal requests. When they bootup it would normally give the same IP if it was available uses MAC addresses etc
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Accepted Solution

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Brian Pringle earned 500 total points
ID: 35095027
Updates will trigger renewal.  Dhcp doesn't update...  It just responds to requests from the clients.  So, if a computer has a leftover IP address and a new one requests an address from the new server, they might have the same address.
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