underscores in A queries
ler762 at gmail.com
Fri Apr 9 19:21:35 UTC 2021
On 4/9/21, John W. Blue via bind-users wrote:
> It would seem that underscores is one of those characters in DNS that leads
> a double life.
> RFC’s say that underscores are disallowed for use in hostnames
Right. But it's **hostnames** and not everyone enforces that rule :(
> but SRV
> records use it to indicate service type et al.
SRV records aren't hostnames, nor are CNAME records, TXT, etc.
I've got this bit in my notes re "check-names response fail;"
# also see dns-operations at lists.dns-oarc.net
# [dns-operations] about the underline in hostname
# where the consensus is to not do this check on resolvers
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