Static IP restriction question

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Sep 28th, 2007
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I'm looking for a way to prevent a device from being connected to my network with a static IP address that is the same as other devices that I've already assigned static IP addresses to. For example, I don't want a random user to be able to set their laptop to a static IP of and cause a conflict with a server that has the same IP address. I would like to be able to, at a switching level, disable network access to that user's pc and avoid the conflict. I would like an automated way to do this, if possible. Does anyone know of any solution? Thanks!

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pstebner1 Fri, 09/28/2007 - 13:03
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Hi David-

I'm not sure what kind of switch you are using, but I assume that it supports 802.1x, which is a Layer 2 based authentication method. This is exactly what you need in your situation, as it will keep any unauthorized pcs off of your network.

Here is a tech note on how to configure it, specifically for a 3750 switch:




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