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ns-revalidation's Introduction

ns-revalidation

Delegation Revalidation by DNS Resolvers

This document recommends improved DNS [RFC1034] [RFC1035] resolver behavior with respect to the processing of Name Server (NS) resource record sets (RRset) during iterative resolution. When following a referral response from an authoritative server to a child zone, DNS resolvers should explicitly query the authoritative NS RRset at the apex of the child zone and cache this in preference to the NS RRset on the parent side of the zone cut. Resolvers should also periodically revalidate the child delegation by re-quering the parent zone at the expiration of the TTL of the parent side NS RRset.

Rendered versions of the current document can be found at the following links:

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ns-revalidation's Issues

Add Implementation status section

Redhat Enterprise Linux has been running this for years without problems
As reported by @paulwouters at the dnsop session at the IETF 119

Knot resolver does it for the root
Unbound does it when enabled for harden referral path

QNAME minimization

This is more of a nitpick at this point, so let me just file it as an issue.

[QNAME minimization] would provide a way to definitively learn the child zone's authoritative NS RRset.

I disagree with that. The RFC 7816 proposes to ask NS one label below apex, not on the apex itself:

the QNAME that is the original QNAME, stripped to just one label more than the zone for which the server is authoritative

Revalidation will cause more traffic

root-servers.net will receive at least 26 times the number of priming queries, plus the extra queries needed to get to root-servers.net. Would be nice to create a formula to get to the number.

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