Adaptive DNS Discovery (ADD)
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Proposed Working Group Charter

Sending DNS messages over encrypted transports, as defined in DNS over
TLS (DoT) [RFC 7858] and DNS over HTTPS (DoH) [RFC 8484], provides
benefits to the security and privacy of DNS data. Clients, such as
applications and host operating systems, have started adopting these
protocols to provide these user benefits.

This working group will focus on discovery and selection of DNS resolvers
by DNS clients in a variety of networking environments, including public
networks, private networks, and VPNs; supporting both encrypted and
unencrypted resolvers.

Clients adopting encrypted DNS protocols need to determine which DNS
servers support encrypted transports, and which server to use for specific
queries if multiple servers are available. These decisions can vary based
on the network environment, and also based on the content and purpose of
the client queries.

Network operators that start offering DNS encryption on their servers also
need a way to indicate this support to clients. Communicating information
about resolver configuration and behavior allows clients to make more
informed decisions about which DNS servers to use. For example, a resolver
may be able to resolve private or local names as a split DNS server.

The Adaptive DNS Discovery (ADD) working group will work on the following
deliverables:

- define a mechanism that allows clients to discover DNS resolvers,
including encrypted DNS servers, that are available to the client
either on the public Internet or on private or local networks;

- define a mechanism that allows communication of DNS resolver
information to clients for use in selection decisions;

- develop an informational document that describes how client
applications and systems can manage selection of DNS resolvers
in various network environments and use cases.

This working group will coordinate with dnsop, doh, and dprive for any
changes required in DNS protocols and will make sure that those
groups are included in major document reviews at appropriate times.
It will also work with capport to ensure that solutions are applicable
to captive networks.