i386/110997: Some Domain IN FreeBSD can't analysis IP

[Rui Paulo]

The following reply was made to PR i386/110997; it has been noted by GNATS.

From: Rui Paulo <rpaulo at fnop.net>
To: joejoe <joejoe at saturn.yzu.edu.tw>
Cc: freebsd-gnats-submit at FreeBSD.org
Subject: Re: i386/110997: Some Domain IN FreeBSD can't analysis IP
Date: Mon, 02 Apr 2007 17:57:00 +0100

 joejoe wrote:
 >> Number:         110997
 >> Category:       i386
 >> Synopsis:       Some Domain IN FreeBSD can't analysis IP
 >> Confidential:   no
 >> Severity:       critical
 >> Priority:       high
 >> Responsible:    freebsd-i386
 >> State:          open
 >> Quarter:        
 >> Keywords:       
 >> Date-Required:
 >> Class:          sw-bug
 >> Submitter-Id:   current-users
 >> Arrival-Date:   Thu Mar 29 06:20:05 GMT 2007
 >> Closed-Date:
 >> Last-Modified:
 >> Originator:     joejoe
 >> Release:        6.2 Stable
 >> Organization:
 > Yuan Ze University
 >> Environment:
 > FreeBSD 6.2-STABLE
 >> Description:
 > When domain have "_" in FreeBSD can't analysis IP
 > But in linux , windows or other OS is OK
 > 
 > EX:
 > 
 >> How-To-Repeat:
 > ping stncenter.ets.org
 > traceroute stncenter.ets.org
 > nslookup stncenter.ets.org
 >> Fix:
 > 
 >> Release-Note:
 >> Audit-Trail:
 >> Unformatted:
 >  >ping www.emega.com.tw
 >  ping: cannot resolve www.emega.com.tw: Unknown server error
 >  
 >  >traceroute www.emega.com.tw
 >  traceroute: unknown host www.emega.com.tw
 >  
 >  but nslookup is ok
 >  > nslookup www.emega.com.tw
 >  Non-authoritative answer:
 >  Name:    trade_web.emega.com.tw
 >  Address:  203.69.48.131
 >  Aliases:  www.emega.com.tw
 >  
 >  
 >  >ping stncenter.ets.org
 >  ping: cannot resolve stncenter.ets.org: Unknown server error
 >  
 >  >traceroute stncenter.ets.org
 >  traceroute: unknown host stncenter.ets.org
 >  
 >  >nslookup stncenter.ets.org
 >  stncenter.ets.org       canonical name = stncenter_vip.ets.org.
 >  Name:   stncenter_vip.ets.org
 >  Address: 144.81.87.110
 
 You should not have underscores ("_") in hostnames.
 
 RFC 952 (http://www.faqs.org/rfcs/rfc952.html) explains what characters 
 are allowed in a hostname.
 RFC 1123 (http://www.ietf.org/rfc/rfc1123.txt) relaxes the definition of 
 a hostname a bit by allowing it to start with a digit.
 
 nslookup comes from BIND (named) but it does not error out like the 
 resolv library does. So, again, using an underscore gives an 
 unpredictable result: it may work, but it may not.
 
 Concluding, I don't think this is a FreeBSD problem.
 
 -- 
 Rui Paulo | PGP: F0E4 C7C7 1653 79B7 78DC  DD73 64FA B2C6 CF45 1F84