Are underscores no longer supported in Bind 9.4?

[Kevin Darcy]

Jake Morrisey wrote:
> Does bind 9.4 no longer support underscores (_) in the A records?
> I know I have these in many records in versions before 9.4.
> Here is the error that I am getting now.
>
> Feb 28 18:29:54 t141 named[8767]: db.example.com:77:
> test_underscore.example.com: bad owner name (check-names)
>
> As soon as I remove the A record with the underscore it in, everything is
> fine and the zone loads.
>
> Is this a new rule / RFC?
>   

No, actually, it's a very *old*, arguably obsolete RFC (RFC 952).

BIND has flip-flopped over the years on whether it should be in the 
business of enforcing *hostname* (as opposed to DNS) standards. Recently 
the pendulum has swung back in the direction of "we'll enforce them", so 
you'll need to fiddle with your "check-names" settings if you have 
underscores in your names and you want to exorcise the spurious 
failures/warnings from BIND.

                                                                         
                                 - Kevin