[166564] in North American Network Operators' Group
Re: Reverse DNS RFCs and Recommendations
daemon@ATHENA.MIT.EDU (Mark Andrews)
Wed Oct 30 18:22:10 2013
To: Scott Howard <scott@doc.net.au>
From: Mark Andrews <marka@isc.org>
In-reply-to: Your message of "Wed, 30 Oct 2013 15:01:55 -0700."
<CACnPsNUxTa3vYQSxuTE4x9NXFm_o+2Bp7HqMBApXcm5_G5Zr2Q@mail.gmail.com>
Date: Thu, 31 Oct 2013 09:21:38 +1100
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
In message <CACnPsNUxTa3vYQSxuTE4x9NXFm_o+2Bp7HqMBApXcm5_G5Zr2Q@mail.gmail.com>
, Scott Howard writes:
> On Wed, Oct 30, 2013 at 2:33 PM, Nolan Rollo <nrollo@kw-corp.com> wrote:
>
> > So in the four examples below, 3 of them preface the IP with an alpha
> > character. Charter however, starts the rDNS off with a number. I'm not
> > arguing with anyone but what potential problems could that cause with DNS?
> > I'm also thinking of the famous www.1and1.com, where the number "1"
> > starts off one of the sections.
> >
>
> Using domain name parts that start with a number will likely cause issues
> for anyone running resolvers written in the 80's.
>
> Anyone running resolvers that are less than ~25 years will likely not have
> any issues.
>
> Scott
To be more precise it will cause no problems with the DNS. Some
pre RFC 1123 gethostbyname implementations may reject the name
but the DNS doesn't care.
Mark
--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: marka@isc.org
