General discussion


Restricting DHCP Assignment

By wills.jason ·
I have a user plugging into the network with his laptop that is not on the domain, and is picking up a dhcp assigned ip address, this causes a problem as he can then bypass the internet filtering software and go wherever he likes - is there any way you can get DHCP to only assign IP addresses to domain computers, therefore stopping this 'plugging' in?

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by dRb63 In reply to Restricting DHCP Assignme ...

Yep. You'll need to assign IP's by the MAC. Doing so will only allow systems with the approved MAC to have an IP, thus allowing it on the network.

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by Oldefar In reply to Restricting DHCP Assignme ...

The "static" assignment which ties an IP to a MAC is probably the simplest approach. A good tutorial can be found at and although it is for Linux, the concepts will apply in other environments.

A more secure approach is to implement Radius and make Radius authentication part of your DHCP. If you are primarily a Cisco shop, look at

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by jaboy78 In reply to Restricting DHCP Assignme ...

u can block his laptop by using MAC address and set into your DHCP server on giving ip address to thatlaptop(blocking).

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