Date: Tue, 7 Oct 2003 16:01:23 -0400 (EDT) From: Matthew George <mdg@secureworks.net> To: Andi Hechtbauer <anti@spin.de> Cc: freebsd-stable@freebsd.org Subject: Re: good address will not resolve in freebsd (_ in host names) Message-ID: <20031007155846.J25531@localhost> In-Reply-To: <86r81o6g2e.fsf@yps.hq.spin.de> References: <Your message of "Tue, 07 Oct 2003 10:15:10 CDT." <200310071631.aa97061@salmon.maths.tcd.ie> <86r81o6g2e.fsf@yps.hq.spin.de>
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On Tue, 7 Oct 2003, Andi Hechtbauer wrote:
> Just FYI,
>
> Restrictions on hostname character sets seem obsoleted by this:
>
> >From RFC2181, Section 11
>
> [...] any binary string whatever can be used as the label of any
> resource record. Similarly, any binary string can serve as the
> value of any record that includes a domain name as some or all of
> its value (SOA, NS, MX, PTR, CNAME, and any others that may be
> added). Implementations of the DNS protocols must not place any
> restrictions on the labels that can be used. In particular, DNS
> servers must not refuse to serve a zone because it contains labels
> that might not be acceptable to some DNS client programs. [...]
>
> Regards,
> Andi
>
>
underscores are part of the SRV RR spec for services and protocols ...
from RFC 2782:
The format of the SRV RR
Here is the format of the SRV RR, whose DNS type code is 33:
_Service._Proto.Name TTL Class SRV Priority Weight Port Target
(There is an example near the end of this document.)
--
Matthew George
SecureWorks Technical Operations
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