deny machines which have configured static ips or configured ip manually

[Simon Hobson]

ARUN CHAKRAPANI RAO wrote:

>Is there any method in dhcp, I can configure which will deny access 
>to those machines which have been configured manualy ip instead of 
>the ip which is being provided by our dhcp server

None whatsoever.
You would need external tools to track leases offered by your server 
and what what's connected to the network. If it finds a rogue device, 
it would then need to take actions unrelated to your DHCP server 
(such as blocking that MAC at the router or switch).

Randall has mentioned one, I'm sure there are many homegrown 
solutions in use around the world.

As an alternative to tracking and blocking rogue devices, you might 
want to look at whether it's possible to filter the "good" traffic. 
Ie, on each consumer facing port, block all traffic but DHCP 
initially. Once a lease if granted, then open up the port to allow 
traffic from the IP leased. That would avoid the window where someone 
can self assign an IP and cause conflict, and you detecting it and 
blocking it.
-- 
Simon Hobson

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