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Set up DHCP on a Small Business Server 2003

Posted on 2011-03-09
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I need to move the DHCP off the router and onto the Small Business server because my router is limiting my IP Addresses that I can hand out.

What is the best way to set up DHCP on my Small Business Server 2003?
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Question by:mrmyth
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by:Rob Williams
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ID: 35089313
See "Configuring Settings for an Existing DHCP Server Service on Your Network" 1/2 way down the page.
http://technet.microsoft.com/en-us/library/cc747341.aspx
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Rob Williams earned 500 total points
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ps- and the section following that; "Moving the DHCP Server Service to the Computer Running Windows Small Business Server 2003"
It is all specific to your server.
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by:mrmyth
ID: 35089500
Thanks, that is very helpful. Can you tell me what happens when an address is excluded from distribution and it is also set as a reservation for a particular device. Are reservations always manually entered or is there some other way that they can be added without typing them in directly? In other words, can a device create a reservation for any reason?
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LVL 77

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by:Rob Williams
Rob Williams earned 500 total points
ID: 35089602
When you enable DHCP is will automatically create an exclusion for the server itself and the router other than that it will make the entire x.x.x.1-254 subnet available for DHCP. You can change that range if you like. Often folk will make it something like x.x.x.101-199
An exclusion just assures the DHCP will not assign a particular IP to any device.

After that all exclusions and reservations have to be made manually.
Generally you don't make exclusions, but other than for servers I prefer reservations for anything for which you would normally use a static IP. Reservations show up in the DHCP management console with all the other DHCP address leases. This saves having to document static IP's.

If you really want to tighten down your network you can create a reservation for every device on the network and an exclusion for the remaining IP's. When you do so an unknown device cannot get a DHCP address assigned to it. This is not often done though.
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by:mrmyth
ID: 35089873
Thank you. It's weird because there is a reservation for an Airport Express, and I know I didn't put it there and I don't think anyone else has that access. Could the reservation have been made by the Airport Express when it joined the network?

What if I excluded that, would it fall off the network and appear as another IP?

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by:Rob Williams
Rob Williams earned 500 total points
ID: 35089934
The server can automatically make exclusions but a reservation has to be made manually.
Is the Airport Express a network adapter? If so the server might make an exclusion, but not a reservation.
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by:Rob Williams
ID: 35089978
Thanks mrmyth. Good luck with the project.
Cheers!
--Rob
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