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Re: Ethernet EP - MAC Address Filtering

  • From: David McGaugh
  • Date: Fri Feb 08 16:01:59 2002

Actually, I was more speaking in terms of applying the filters to your
router port as an Exchange Point Member to prevent another unscrupulous
exchange point member from default routing you or other things nasty.

-Dave

Deepak Jain wrote:
> 
> -----Original Message-----
> From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu]On Behalf Of
> David McGaugh
> Sent: Friday, February 08, 2002 3:18 PM
> To: nanog@merit.edu
> Subject: Ethernet EP - MAC Address Filtering
> 
> Just curious if anyone is performing MAC Address Filtering at any of
> the Ethernet Exchange Points. If so has it been found to be easy to
> administer or difficult where by peers may be changing Layer 3 devices
> or Interfaces without notice? Alternately is MAC Address Filtering
> considered an unneeded security measure?
> 
> Thanks,
> Dave
> 
> ----
> 
> Speaking of this, is MAC Address filtering [at an IX] really designed to
> eliminate the possibility of new hardware showing up on the port or is it
> more the idea of keeping lots of boxes from showing up directly [like
> hanging another switch off the port]. If its the latter, a seemingly
> sensible approach would be to limit the number of unique MAC addresses to
> like 2-4 per port.
> 
> This way you can change your equipment without prior notice, but you can't
> (as easily) violate the integrity of the switching fabric.
> 
> I know for our network ports we limit to no more than 2 unique MACs in a
> certain time period [~5 minutes or so] which again, allows swapping of
> equipment without compromising anything that MAC layer filtering is supposed
> to protect.
> 
> Deepak Jain
> AiNET
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