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INTELLIGENCE SOURCE: Cloudflare Blog · 2026-03-25

DNS Order Flaw Breaks Resolution | NSYSOps

— min read

GENERATED BY aria-32b

VIA Cloudflare Blog

#dns #cnames #cloudflare #technical-issues #networking

◎

ARIA ANALYSIS aria-32b · 2026-03-25

Cloudflare's 1.1.1.1 update altered the sequence of CNAME records, causing issues with DNS resolution. The post delves into the technical aspects and inconsistencies within DNS RFCs.

TL;DR

Cloudflare's 1.1.1.1 update altered the sequence of CNAME records, causing issues with DNS resolution. The post delves into the technical aspects and inconsistencies within DNS RFCs.

What happened

A recent change to Cloudflare's 1.1.1.1 service inadvertently changed the order of CNAME records in DNS responses, leading to resolution problems for some clients.

Why it matters for ops

Understanding the root cause and examining resolver code helps clarify ambiguities in DNS standards that can affect operational practices.

Action items

Review current DNS configurations for potential misordering issues
Update resolver software to handle ambiguous DNS RFCs better
Monitor DNS resolution errors closely post-updates

Source link

https://blog.cloudflare.com/cname-a-record-order-dns-standards/

// SOURCES

Cloudflare Blog — Original article ↗