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RFC 9103: DNS Zone Transfer over TLS

In plain English — editorial summary, not part of the RFC

DNS zone transfers are transmitted in cleartext, which gives attackers the opportunity to collect the content of a zone by eavesdropping on network connections. The DNS Transaction Signature (TSIG) mechanism is specified to restrict direct zone transfer to authorized clients only, but it does not add confidentiality. This document specifies the use of TLS, rather than cleartext, to prevent zone content collection via passive monitoring of zone transfers: XFR over TLS (XoT). Additionally, this specification updates RFC 1995 and RFC 5936 with respect to efficient use of TCP connections and RFC 7766 with respect to the recommended number of connections between a client and server for each transport.

Document record

Document ID
RFC9103
Published
August 2021
Authors
W. Toorop; S. Dickinson; S. Sahib; P. Aras; A. Mankin
Status
PROPOSED STANDARD
Stream
IETF
Area
int
Pages
32
Also known as
—
Updates:
RFC 1995, RFC 5936, RFC 7766

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The document record above — title, authors, date, status, stream, area, relationships, DOI and errata — is imported verbatim from the public RFC Editor index. The “in plain English” section is editorial: written by The metasystema editorial team, not part of the RFC. Where the two differ, the RFC text governs.

Last checked against the RFC Editor index on . RFCs are never revised after publication; changes are issued as new documents.

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canonical URL: /rfc/9103-dns-zone-transfer-over-tls