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MAC addres of remote machine  RSS feed

 
Alex Bokov
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We have web servers, and do filter out some traffic base on some criteria.
Our concurrent company said that they have filter based on MAC address.
By my knowledge MAC address does not go far than first router/bridge.
Is there some way to get MAC address of remote machine, or it was just bluff?
 
Marco Ehrentreich
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Hi Alex,

you're right (at least for most internet connections ;-))! The concept of MAC addresses exists on OSI layer 1/2 (usually Ethernet). As soon as PPP connections or something like that come into play there aren't any MAC addresses any longer. I'm not sure about high speed connections or DSL links but I'm pretty sure that even if there were MAC addresses they'd be a bad criterion for a filter because they can be spoofed or replaced like most things in a network packet.

So in short in a LAN it _COULD_ be possible to do basic filtering with MAC addresses but it's inappropriate for internet traffic. In any case it's not sufficient if you are concerned about real security.

Marco
 
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