[dns-operations] Any DNAME usage experience?

John Levine johnl at taugh.com
Mon Mar 30 15:46:44 UTC 2020

In article <5A408169-12B7-4F39-A69B-20B6E1EF8ADA at opendns.com> you write:
>A few interesting things about DNAMES:
>* For unsigned zones, resolvers don’t have to do anything, but the DNAME itself can break
>  - The synthesized CNAME makes the resolver “just work”
>  - RFC 3597 section 7 says that resolvers MUST uncompress DNAMEs.  If they don’t, they may serve corrupt RRs
>    So a nameserver that serves compressed DNAMEs must be “fixed” by the resolver.

Have you seen any nameservers that compress DNAMEs?  That would be a
very strange bug since it was always forbidden.

John Levine, johnl at taugh.com, Primary Perpetrator of "The Internet for Dummies",
Please consider the environment before reading this e-mail. https://jl.ly

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