Aug 10, 2011
tom
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Assign DHCP IPs for specific MAC prefixes on Windows Server 2008 R2

Question

I’m running Windows Server 2008 R2 for my DHCP server. We are about to switch over to a VoIP system and Cisco VoIP phones. I would like to assign a specific range of IPs to these phones which will have a common MAC prefix (ex. 00:01:02). I would prefer to have them in the same scope as our computers if possible. Does anyone have any suggestions?

Answer

You can use reservations to map specific IP addresses to specific MAC addresses, but there is no way to select a range of addresses (or even a scope) based only on the MAC prefix. I would suggest you place those devices on a separate network segment (physical or VLAN) and use a DHCP scope for that; this will also come a lot handy if/when you want to apply firewall and/or QoS policies to those devices.

Check more discussion of this question.

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