cloudflare blesses us with another incident report that's just delightful to read (well, before blessing us with an incident that prompted it, naturally).
and DNS strikes again! This time, in the form of RFC 1034 ambiguity on RR ordering and different client implementations
blog.cloudflare.com
What came first- the CNAME or the A record
A recent change to 1.1.1.1 accidentally altered the order of CNAME records in DNS responses, breaking resolution for some clients. This post explores the technical root cause, examines the source code...