June 2018
Intermediate to advanced
368 pages
11h 1m
English
Content preview from Managing Mission - Critical Domains and DNS
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Edns-client-subnet
In the past, when a nameserver received a query, it was only aware of the remote IP of the other nameserver. It had no awareness of the end user client or device making the request, unless they just happened to be on the same host or device.
This can be a problem when trying to do things such as geo-target your DNS responses, especially if end users are employing large public resolver infrastructures that are themselves anycasted (think Google Public DNS, OpenDNS, or Quad9).
edns-client-subnet (https://trac.tools.ietf.org/html/rfc7871) addresses this by sending a subnet of the client stub-resolver, usually the first three octets of an IPv4 address or 56 bits of an IPv6 address.
The authoritative nameserver, or any middleware ...
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