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RFC 6281, "Understanding Apple's Back to My Mac (BTMM) Service", June 2011

Source of RFC: IETF - NON WORKING GROUP
Area Assignment: tsv
See Also: RFC 6281 w/ inline errata

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Errata ID: 5676
Status: Verified
Type: Technical
Publication Format(s) : TEXT
Reported By: Stuart Cheshire
Date Reported: 2019-03-27
Verifier Name: Mirja Kühlewind
Date Verified: 2020-03-04

Section 5 says:

Following our example for alice, it queries the SRV RR for _dns-
update-tls._udp.alice.members.me.com.  Then, the updates are sent to
the dynamic DNS server returned in the Target field of query response.

...

So alice's host issues a query for
_dns-llq-tls._udp.alice.members.me.com
and obtains the server that provides LLQ service.

It should say:

Following our example for alice, it queries the SRV RR for _dns-
update-tls._tcp.alice.members.me.com.  Then, the updates are sent to
the dynamic DNS server returned in the Target field of query response.

...

So alice's host issues a query for
_dns-llq-tls._tcp.alice.members.me.com
and obtains the server that provides LLQ service.

Notes:

In both cases “_udp” should be replaced by “_tcp”.

The IANA service type “_dns-update-tls._tcp” is DNS Update (RFC 2136) over TLS over TCP.

The IANA service type “_dns-llq-tls._tcp” is DNS Long-Lived Queries (draft-sekar-dns-llq-03) over TLS over TCP.

In both cases RFC 6281 inadvertently used the label “_udp” instead of “_tcp”. Of course, TLS runs over TCP, not UDP. (I do know that DTLS can be used over UDP, but that is not what is being used here.)

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