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How to replace existing DHCP Scope with a new one?

Posted on 2012-04-08
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Last Modified: 2012-06-27
Okay, so I konw there are a gazillion "how to change DHCP scope" questions but I just want to confirm the network affects of creating new scope that replaces an existing one.
So here is what i understand. In order to extend my DHCP range i have delete the existing scope and create a new scope with same IP range (different subnet mask)
Steps:
1. Delete the old scope with subnet mask 255.255.255.0
2. Create a new scope with subnet mask 255.255.254.0

So how long does it take the network to "recover" from this change?
In the mean time does the network stop working?
the network has to be working by Monday AM

thank you
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Question by:ronfast
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Expert Comment

by:motnahp00
ID: 37821950
It will really depend on your lease duration.

I would run the following each DHCP client to ensure that it is reflecting the new scope configuration:

ipconfig /release & ipconfig /renew
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Author Comment

by:ronfast
ID: 37821953
oh yeah. great point I should have thought of that. THis is the first time I've done this and it makes me nervous when I delete network stuff.
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Accepted Solution

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motnahp00 earned 500 total points
ID: 37821968
Understood. Good luck with your new configuration.

Out of curiosity, why are you requesting the question to be closed versus answered?
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Author Comment

by:ronfast
ID: 37821969
Oh no. I didn't mean a request to close. Arg. Not intentional.
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Author Comment

by:ronfast
ID: 37821974
One more question. All of my servers have 255.255.255.0 mask do i change all of those as well or just the DHCP mask
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Expert Comment

by:motnahp00
ID: 37822003
As long they are DHCP recipients, the scope will take care of them.
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Author Comment

by:ronfast
ID: 37822016
thank you so much!! I took the plunge and all the clients are getting the IPs.

yay
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Expert Comment

by:motnahp00
ID: 37822017
You're welcome. Good luck.
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Author Comment

by:ronfast
ID: 37822028
Okay, so i'm sorry one more question.
When you have the new subnet mask., the first IP addressed are 192.168.100.53-.254
When it fills that range what will the new IPs look like?
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Expert Comment

by:motnahp00
ID: 37822036
Sorry, but subnet masking is definitely not one of my strengths.
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Author Comment

by:ronfast
ID: 37822168
there was a DHCP calculator on a website that i used.
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