allowing underscores in A/AAAA records
Mark Andrews
Mark_Andrews at isc.org
Wed Jun 20 11:38:27 UTC 2007
> 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
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