If you've got the ability to setup your own routing, DNS, and DHCP, you may 
want to look at Netreg. http://netreg.sourceforge.net/ From the site:

NetReg is an automated system that requires an unknown DHCP client to register 
their hardware before gaining full network access. Through a simple web 
interface, the client is prompted for their user identification. Powerful 
scripts then retrieve the client's network fingerprint and store it along with 
the user's information in a database. The database provides administrators with 
real-time information for troubleshooting and auditing their networks. The 
entire system was developed utilizing unmodified, open-source servers and 
in-house developed CGI programs. 

Once a system is logged in, it stays in the tables till flushed.

Open source, free, & I've seen it in use. (I used to work with the guys who 
developed it.)

Cheers!

Pat

-- 
[email protected]
Pat Ramsey
@pat_ramsey

Code that works,… beautifully
http://slash25.com




On Aug 16, 2010, at 3:48 PM, Chris Johnson wrote:

> Jacob,
> 
> We totally feel your pain and while there are several solutions in this space 
> they aren't cheap and difficult to manage. 
> 
> We are working on a solution now that we will beta test with Blankspaces and 
> based on results make our solution available. 
> 
> Your idea is a good one but it will still be difficult to pinpoint a problem 
> and the culprit just by restricting by MAC address. 
> 
> Chris
> ---------------------------------------------
> Technology Strategist
> Untangled Solutions, LLC
> Direct: (909) 563-8578 x101
> [email protected]
> www.untangledsolutions.com
> 
> This E-mail is covered by the Electronic Communications Privacy Act, 18 
> U.S.C. 2510-2521 and is legally privileged. This information is confidential 
> and is intended only for the use of the individual or entity named above. If 
> the reader of this message is not the intended recipient, you are hereby 
> notified that any dissemination, distribution or copying of this 
> communication is strictly prohibited. Please immediately notify Untangled 
> Solutions, LLC. and destroy the message.
> 
> On Aug 16, 2010, at 2:57 PM, Jerome Chang <[email protected]> wrote:
> 
>> Fyi
>> 
>> Jerome, from his iPhone =)
>> 
>> Begin forwarded message:
>> 
>>> From: Jacob Sayles <[email protected]>
>>> Date: August 16, 2010 12:43:49 PM PDT
>>> To: coworking <[email protected]>
>>> Subject: [Coworking] Passive Network Monitoring
>>> Reply-To: [email protected]
>>> 
>>> Hello,
>>> 
>>> I'm researching ways to monitor network usage that is unobtrusive and 
>>> invisible to the users of our space.  We considered requiring everyone to 
>>> login to the system but I'm not sure how to indefinitely log someone in and 
>>> our residents don't want to have to log in every day on every device.  One 
>>> thought I had was to export the ARP table of our firewall and match the mac 
>>> addresses to individual users in our member database.  That is rather crude 
>>> and only gets us who's on, when.  Any other tricks/tools people are using?  
>>> Anyone interested in forming a working group to explore this together?
>>> 
>>> Jacob
>>> 
>>> ---
>>> Office Nomads - Individuality without Isolation
>>> http://www.officenomads.com -  (206) 323-6500
>>> 
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