DHCP security

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While I realize DHCPd isn't a security program of any kind, this does have to do with it. So I just switched our entire network over to DHCP assigned IPs in preparation for another project. But in doing that, I've come to realize that anyone could plug in their machine and manually set their IP address and by-pass the DHCP discovery all together. And thus also gaining access to our internal network, something we might not necassarily want to allow. So the question now is, is there some way to restrict traffic to only those assigned IPs (through DHCP) and block anything else that happens to show up on the network? Maybe through iptables somehow?

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W | It's not a bug - it's an undocumented feature.
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 Ashley M. Kirchner <mailto:ashley@xxxxxxxxxx>   .   303.442.6410 x130
 IT Director / SysAdmin / Websmith             .     800.441.3873 x130
 Photo Craft Imaging                       .     3550 Arapahoe Ave. #6
http://www.pcraft.com ..... . . . Boulder, CO 80303, U.S.A.
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