Date: Thu, 11 Sep 1997 17:28:53 -0700 (PDT) From: "Jonathan M. Bresler" <jmb> To: brandon@roguetrader.com (Brandon Gillespie) Cc: greg@smokey.prismnet.com, freebsd-isp@FreeBSD.ORG, freebsd-questions@FreeBSD.ORG Subject: Re: BIND Question Message-ID: <199709120028.RAA11810@hub.freebsd.org> In-Reply-To: <Pine.BSF.3.96.970911145341.13683A-100000@roguetrader.com> from "Brandon Gillespie" at Sep 11, 97 02:56:46 pm
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Brandon Gillespie wrote:
>
> On Thu, 11 Sep 1997, Greg Stringfellow wrote:
>
> > Here is an interesting question, or at least to me right now.
> >
> > I've got a customer who is trying to send mail to a particular location. The
> > hostname is "HPISD_ADMIN.HIGHLANDPARK.K12.TX.US". I remember reading
> > somewhere about the underscores in a hostname not being valid. But I just
> > can't seem to track it down.
>
> You are right, underscores are not a valid part of a domain name, even
> though old DNS servers would allow them (all that is valid is a-z0-9 and a
> dash, I believe).
rfc1123 amends rfc952
rfc1123:
2.1 Host Names and Numbers
The syntax of a legal Internet host name was specified in RFC-952
[DNS:4]. One aspect of host name syntax is hereby changed: the
restriction on the first character is relaxed to allow either a
letter or a digit. Host software MUST support this more liberal
syntax.
rfc952. "DOD INTERNET HOST TABLE SPECIFICATION" oct '85
not listed in std-index.txt but referenced by rfc1123
which is listed in std-index.txt
rfc952:
1. A "name" (Net, Host, Gateway, or Domain name) is a text string up
to 24 characters drawn from the alphabet (A-Z), digits (0-9), minus
sign (-), and period (.). Note that periods are only allowed when
they serve to delimit components of "domain style names". (See
RFC-921, "Domain Name System Implementation Schedule", for
background). No blank or space characters are permitted as part of a
name. No distinction is made between upper and lower case. The first
character must be an alpha character. The last character must not be
a minus sign or period. A host which serves as a GATEWAY should have
"-GATEWAY" or "-GW" as part of its name. Hosts which do not serve as
Internet gateways should not use "-GATEWAY" and "-GW" as part of
their names. A host which is a TAC should have "-TAC" as the last
part of its host name, if it is a DoD host. Single character names
or nicknames are not allowed.
jmb
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