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 From:  "Lee Sharp" <leesharp at hal dash pc dot org>
 To:  <m0n0wall at lists dot m0n0 dot ch>
 Subject:  Re: [m0n0wall] Captive Portal
 Date:  Tue, 21 Nov 2006 13:08:14 -0600
From: "Lloyd Palfrey" <Lloyd at wsufftrust dot org dot uk>

> I am using MAC address RADIUS authentication for captive portal and I
> keep getting the following in the logs.

> Nov 21 11:22:38 /kernel: arp: moved from 00:12:f0:ca:d0:71
> to 00:12:17:a9:9c:80 on sis0

> 00:12:17:a9:9c:80 Doesn't exist in the radius server.

> Anyone got any suggestions?

> Many Thanks

First, what is your topology?  Do you have things behind APs that use the 
APs MAC?  Could you have a user "borrowing" IP addresses?  Could a given 
user be swapping NICs?