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adding DHCP server to AD domain with Static IP workstation

Posted on 2010-11-29
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Last Modified: 2012-05-10
I have a windows Network running AD 2008.
All of the workstations have static IP addresses.  I now want to change to DHCP.

the dns server has a bunch of dns entires.  most are old and have out of date information.

is there a way to add DHCP and have it find the current PC's and their IP addresses or do I just need to enable DHCP and walk around to all of the PC's and change them to DHCP so they get an address.

I wanted to do it an easy way.  My fear is if I create a scope and then just start swtiching pc's from static to DHCP it will dish out IP's that are in use and cause a mess.
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Question by:lefty431
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10 Comments
 
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Expert Comment

by:KCTS
ID: 34236115
do I just need to enable DHCP and walk around to all of the PC's and change them to DHCP so they get an address. - YES
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by:lefty431
ID: 34236126
what about Scavenging in DNS?  then I can set a scope that doesn't conflict with any static"s?  the problem is that there are static addresses are spread out...
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by:KCTS
ID: 34236143
You can bite the bullet delete any DNS record manually and/or impliment scavenging,  see http://technet.microsoft.com/en-us/library/cc757041(WS.10).aspx
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by:lefty431
ID: 34236145
if I delete the dns record manually, with the once that are alive come back?  or do I hose everything?
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by:KCTS
ID: 34236150
All you will lose are the DNS records - the clients will re-register automatically - and/or you can also set DHCP to register the records for the clients in DNS
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by:lefty431
ID: 34236158
so the end result is dns will populate with clients that are active....

that will help clean a bunch up.  if that works..  then I can find a few gaps and create some scopes.  once everything is set to dhcp I can get PC's groups together...
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Expert Comment

by:KCTS
ID: 34236166
Yes - but wait - why do you want multiple scopes - that is not easily done, by default a DHCP client wll gt the next available address - if you want to control which machines get which addresses then you are going to have to use reservations (not very practical for a lot of machines), or you will have to impliment option classes, which can get quite involved
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by:lefty431
ID: 34236191
Just don't want dhcp to give an address that is already static
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KCTS earned 500 total points
ID: 34236197
If its not practical to chnage all the machines over in one hit, then set up a scope with a limited range of adresses to begin with and extend the scope as you get rid of the static clients.
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by:lefty431
ID: 34236268
that is what I want to do..  the problem is that according to DNS most of the subnet is used.  but really there are only about 60 PC's and 10 Printers....

so if I delete the dns entires and wait until they all check back in (by the way, how often is that) I will be able to get some ranges to do what you stated above....
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