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Expand DHCP scope

Posted on 2016-09-10
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Last Modified: 2016-09-11
I have a 192.168.0x network with 255.255.255.0 subnet mask.

There are currently 200 devices on the network... how allow for 200 more?

The 2008 server is the DHCP server.
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Question by:classnet
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Expert Comment

by:bbao
ID: 41792633
are there any other servers on the same subnet? are the servers using static IPs? are all the client computers using dynamic IPs by DHCP?
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Author Comment

by:classnet
ID: 41792634
Just one server.  The server address is static.  Most clients are using DHCP.  There are a couple of copiers and wireless AP that have static.
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Author Comment

by:classnet
ID: 41792638
Do I just need to change the SN mask to 255.255.254.0?
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LVL 37

Expert Comment

by:bbao
ID: 41792735
for such a scenario, YES, simply change server NIC's subnet mask to 255.255.254.0, then the IP settings of DHCP service via DHCP manager.

be aware two things:

1. depending the existing Client Lease Time set on the DHCP server, the clients may take a while to renew their IP setting with correct mask, commonly from 1 to 7 days. however, rebooting the client computer or running IPCONFIG /RENEW can update with new settings instantly.

2. you need to manually change the local router's subnet mask, if the default gateway is not the server itself.
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Author Comment

by:classnet
ID: 41792748
Actually, changing the subnet mask would only be part of the process.  I'd need to create another scope too I guess (configuring Server 2008 DHCP)?
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LVL 37

Expert Comment

by:bbao
ID: 41792753
why another scope? you got another subnet to create? on the SAME physical network (or VLAN) or multiple networks (or VLANs) separated by a router?
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Author Comment

by:classnet
ID: 41792756
My current scope is from 192.168.0.50 to 192.168.0.250 (200 addresses).  I'd like to be able to accommodate 400 addresses.
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LVL 37

Accepted Solution

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bbao earned 500 total points
ID: 41792843
as you can't edit subnet mask once the scope has been created and activated, you need to delete the existing scope and creat a new one with new mask and other previous settings. that's it.
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Author Closing Comment

by:classnet
ID: 41793281
Thank you
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