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DHCP scope question

Posted on 2009-04-08
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Last Modified: 2012-05-06
Hi Experts,

We are running out of IP addresses on our DHCP server and need to increase the number of hosts on DHCP. Currently we have DHCP set on Windows 2003 Server x32 Standard SP2 with the following details:
Start IP Address: 192.168.4.1
End IP Address: 192.168.4.254
Subnet Mask: 255.255.254.0 Length: 23

With our subnet I would assume we would get 510 addresses. Am I correct? If so can I just change the End IP Address to 192.168.5.254 to get the additional IPs?

We have a number of Cisco Catalyst switches connected with VLANs and having subnet 255.255.254.0 already present in it. Is there something else we would need to change in the network to make sure nothing breaks once we make this change? We are planning to reboot all the hosts when we do this. Please advise. Thanks.
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Question by:abhijitm00
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tigermatt earned 2000 total points
ID: 24102044

A subnet mask of 255.255.254.0 will give you an address range from 192.168.4.1 to 192.168.5.254, correct. You can therefore simply extend the current DHCP scope to have an End IP of 192.168.5.254.

There should be no other special configuration required, provided all devices are programmed with the same subnet mask.

-Matt
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Author Comment

by:abhijitm00
ID: 24108291
Great. We are going to try this out tomorrow and will post our results. Thanks.
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Author Comment

by:abhijitm00
ID: 24118958
Worked thanks.
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Expert Comment

by:tigermatt
ID: 24119428
Thank you!
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