[rfc-dist] RFC 9103 on DNS Zone Transfer over TLS

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Mon Aug 23 21:28:57 PDT 2021

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        RFC 9103

        Title:      DNS Zone Transfer over TLS 
        Author:     W. Toorop,
                    S. Dickinson,
                    S. Sahib,
                    P. Aras,
                    A. Mankin
        Status:     Standards Track
        Stream:     IETF
        Date:       August 2021
        Mailbox:    willem at nlnetlabs.nl,
                    sara at sinodun.com,
                    shivankaulsahib at gmail.com,
                    paras at salesforce.com,
                    allison.mankin at gmail.com
        Pages:      32
        Updates:    RFC 1995, RFC 5936, RFC 7766

        I-D Tag:    draft-ietf-dprive-xfr-over-tls-12.txt

        URL:        https://www.rfc-editor.org/info/rfc9103

        DOI:        10.17487/RFC9103

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.

This document is a product of the DNS PRIVate Exchange Working Group of the IETF.

This is now a Proposed Standard.

STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements.  Please refer to the current edition of the Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the 
standardization state and status of this protocol.  Distribution of this 
memo is unlimited.

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