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 From:  "Lloyd Palfrey" <Lloyd at wsufftrust dot org dot uk>
 To:  "Lee Sharp" <leesharp at hal dash pc dot org>, <m0n0wall at lists dot m0n0 dot ch>
 Subject:  RE: [m0n0wall] Captive Portal
 Date:  Wed, 22 Nov 2006 09:16:55 -0000
I have 22 access points. M0n0wall is the gateway with a captive portal
on it. Radius mac address authentication. DHCP.

I've had a look at 00:12:f0:ca:d0:71's laptop and it all seems good. It
seems to me that 00:12:17:a9:9c:80 is stealing the IP address from
00:12:f0:ca:d0:71. However 00:12:17:a9:9c:80 shows up in Captive Portal
status and shows traffic.. Which is odd as there is no way that
00:12:17:a9:9c:80 can authenticate as it doesn't have an account.

I've added 00:12:17:a9:9c:80 to the MAC address filter on the access
points. This seems to have solved the problem. However there must be a
bug somewhere... How else could 00:12:17:a9:9c:80 authenticate to the

- Lloyd

-----Original Message-----
From: Lee Sharp [mailto:leesharp at hal dash pc dot org] 
Sent: 21 November 2006 19:08
To: m0n0wall at lists dot m0n0 dot ch
Subject: Re: [m0n0wall] Captive Portal

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?


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