[thelist] Attaining reliable MAC Address using javascript

Jeff Wilhelm - TheList thelist at summit7solutions.com
Fri Mar 16 06:37:21 CDT 2007


Good point. IP addresses are *sometimes* changed, based on devices in the
path. MAC addresses are always changed (not changed, but the original is not
advertized).

Regardless, his plan to track unique users / unique sessions (etc...) by MAC
address will not work.

 

-----Original Message-----
From: thelist-bounces at lists.evolt.org
[mailto:thelist-bounces at lists.evolt.org] On Behalf Of Ken Schaefer
Sent: Friday, March 16, 2007 2:47 AM
To: thelist at lists.evolt.org
Subject: Re: [thelist] Attaining reliable MAC Address using javascript

I think you guys are all thinking of IP addresses (proxies, NAT devices etc)
will substitute their own IP address for the original client's IP address.

For MAC addresses, this doesn't go beyond the local collision domain. Each
gateway/router between the client and server substitutes it's own MAC
address on the packet, before forwarding to the next gateway/router, or to
the end recipient.

Cheers
Ken

-----Original Message-----
From: thelist-bounces at lists.evolt.org
[mailto:thelist-bounces at lists.evolt.org] On Behalf Of Jeff Wilhelm - TheList
Sent: Thursday, 15 March 2007 12:58 PM
To: thelist at lists.evolt.org; 'Anthony Baratta'
Subject: Re: [thelist] Attaining reliable MAC Address using javascript

Correct, a proxy server, firewall or other similar device often masquerades
its own MAC address as it is actively managing the connection between the
nodes. This solution will not work as expected.

 

-----Original Message-----
From: thelist-bounces at lists.evolt.org
[mailto:thelist-bounces at lists.evolt.org] On Behalf Of Erik Mattheis
Sent: Thursday, March 15, 2007 3:36 PM
To: 'Anthony Baratta'; thelist at lists.evolt.org
Subject: Re: [thelist] Attaining reliable MAC Address using javascript


For my own interest, is it not the case that a single MAC address can
represent all interfaces behind it as in the case of certain routers or a
shared wireless connection?

-----Original Message-----

> mac addresses are a way to uniquely identify a computer (not using ip
> addresses) that have been brought up in a recent meeting. 

 
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