From owner-freebsd-hackers  Thu Aug 12 15: 0:37 1999
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Date: Fri, 13 Aug 1999 00:59:04 +0300
From: Evren Yurtesen <yurtesen@ispro.net.tr>
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To: Bill Fumerola <billf@jade.chc-chimes.com>
Cc: Michael Mannsberger <mannsber@starmedia.net>,
	freebsd-hackers@FreeBSD.ORG
Subject: Re:(2) hey
References: <Pine.BSF.4.10.9908121608270.99851-100000@jade.chc-chimes.com>
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Well, I am the person who has this problem.
The RFCs does not explicitly say that we should not use underscore
character
as far as I understood. But it suggests which characters we should use.

Also in RFC1033 it says (well the status of this one is UNKNOWN though)
-----------------------------------------------------------------------------
   The domain system allows a label to contain any 8-bit character.
   Although the domain system has no restrictions, other protocols such
   as SMTP do have name restrictions.  Because of other protocol
   restrictions, only the following characters are recommended for use
   in a host name (besides the dot separator):

           "A-Z", "a-z", "0-9", dash and underscore
-----------------------------------------------------------------------------

So Solaris does the right thing by understanding underscore I guess.
Since it is not forbidden to use it in hostnames.

http://www.crynwr.com/crynwr/rfc1035/rfc1035.html#2.3.1.
-----------------------------------------------------------------------------
For example, when naming a mail domain, the user should satisfy both the
rules of this memo and those in RFC-822.  When creating a new host name,
the old rules for HOSTS.TXT should be followed.  This avoids problems
when old software is converted to use domain names.

The following syntax will result in fewer problems with many
applications that use domain names (e.g., mail, TELNET).

<domain> ::= <subdomain> | " "
<subdomain> ::= <label> | <subdomain> "." <label>
<label> ::= <letter> [ [ <ldh-str> ] <let-dig> ]
<ldh-str> ::= <let-dig-hyp> | <let-dig-hyp> <ldh-str>
<let-dig-hyp> ::= <let-dig> | "-"
<let-dig> ::= <letter> | <digit>
<letter> ::= any one of the 52 alphabetic characters A through Z in
upper case and a through z in lower case
<digit> ::= any one of the ten digits 0 through 9
-----------------------------------------------------------------------------

BTW. I could not really understand this explanation in RFC1035. 
This is very cryptic for me :( 

Thanks for the help

Evren Yurtesen
yurtesen@ispro.net.tr


Bill Fumerola wrote:
> 
> On Thu, 12 Aug 1999, Michael Mannsberger wrote:
> 
> > ping  www.atayatirim.com.tr works under Sun but not in FreeBSD - why?
> > FreeBSD doesn't like "_" in a URL!!!!!!!!
> 
> Uhm, that's a hostname, but yes, FreeBSD doesn't like it. Windows is
> okay with it, however.
> 
> http://www.crynwr.com/crynwr/rfc1035/rfc1035.html#2.3.1.
> However explains why this hostname is not allowed. FreeBSD is not violating
> RFC.
> 
> --
> - bill fumerola - billf@chc-chimes.com - BF1560 - computer horizons corp -
> - ph:(800) 252-2421 - bfumerol@computerhorizons.com - billf@FreeBSD.org  -
> 
> hawk% ping wam_notes.internal.chc-chimes.com
> ping: cannot resolve wam_notes.internal.chc-chimes.com: Unknown server error
> hawk% dig wam_notes.internal.chc-chimes.com |grep notes
> ; <<>> DiG 8.1 <<>> wam_notes.internal.chc-chimes.com
> ;;      wam_notes.internal.chc-chimes.com, type = A, class = IN
> wam_notes.internal.chc-chimes.com.  1D IN CNAME  notes.internal.chc-chimes.com.
> notes.internal.chc-chimes.com.  1D IN A  172.16.81.245
> 
> It should be noted that the dns server that my workstation queried is running
> FreeBSD and has no trouble _serving_ hostnames with an underscore.
> 
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