[dns-operations] Embedding MAC address in DNS requests for selective filtering

Brian Hartvigsen (bhartvig) bhartvig at cisco.com
Mon Jan 25 16:48:59 UTC 2016


> This is then probably implemented by the home router (CPE) appending the MAC
> address to queries, presumably over EDNS.  The ISP nameserver can then
> conditionally filter queries or not, based on customer IP and client MAC
> address.

For OpenDNS this implementation varies by CPE vendor.  They are all built on top of EDNS.  The option code and specific data sent varies though.  The data could be a MAC address or it could be a “unique” identifier to the CPE.  (e.g. If you “log on” to the filter from device A versus your child on the same device, it would be the same MAC, but potentially different identifiers.)

— Brian
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