allowing underscores in A/AAAA records

[Mark Andrews]

> It seems that some people like to put underscores "_" in their
> hostnames.
>  
> This seems to be popular in Microsoft centric organizations.
>  
> If they then enter this as an A (or AAAA) record in bind, an error
> is generated. (Rightly so).
>  
> One can turn off check-names or set it to warn so that the zone
> still loads.
>  
> One can run named-checkzone -k warn|ignore.
>  
> But I would like to be able to allow underscores and still validate
> the rest of the label. (ie: check that label length is not longer than 
> the max, the total length of the domain name is not too long,
> no _other_ invalid characters, etc)

	Yes, Yes, No.  We only support checking that a
	domain name is also a valid hostname or not. 
	The length limits are common* to domain names
	and hostnames.

	Mark

	* hostnames can be one character longer than you can fit
	into a hostname (255 vs 254).  label length it the same.

> I don't see a way to do this other than to write my own
> name validation routine.
>
> Is there a way to do this?
>  
> Thanks
> --
> Jack Tavares
> NOTE:  I am at GMT+2
> 
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews at isc.org