Hello.

Is CSYNC/NSEC with an empty type bitmap:
a) syntactically valid record
b) should it trigger FORMERR (= whole message ignored)

I have found zero samples of CSYNC/NSEC with empty bitmaps in the traffic capture between resolver and auths.

Currently dnspython 2.8.0 accepts empty bitmap for both but BIND accepts it only for CSYNC.

WDYT?

--
Petr Špaček
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