Xref: utzoo comp.protocols.tcp-ip:14144 comp.protocols.tcp-ip.domains:535
Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!ub!rutgers!ub.d.umn.edu!cs.umn.edu!peiffer
From: peiffer@cs.umn.edu (Tim Peiffer "The Net Guy")
Newsgroups: comp.protocols.tcp-ip,comp.protocols.tcp-ip.domains
Subject: Re: gethostbyaddr() failing
Message-ID: <1990Dec17.182114.14182@cs.umn.edu>
Date: 17 Dec 90 18:21:14 GMT
References: <1990Dec16.191345.22482@engin.umich.edu> <9012170259.AA06606@nsipo.arc.nasa.gov>
Organization: University of Minnesota, Minneapolis - CSCI Dept.
Lines: 50

Milo Medin <9012170259.AA06606@nsipo.arc.nasa.gov> writes:
>The problem in your case is that whoever runs your DNS configuration accidentally
>left out the address in question, or used the wrong name in the PTR record.

Merit misconfigured ccb4.merit.edu as ccb3.merit.edu.  This
misadventure within the DNS did actually point out a few possible 
problem areas that I would like to ask about.

	1) What is the correct use of wildcarding within named
	   zone files?
	2) What is the most effective (and correct) method of
	   showing hosts with dynamic addresses within the .rev
	   zone files?

Consider the following:
1) Fastpath Appletalk to TCP/IP gateway.
2) Kstar 8.0+ and PhaseII Appletalk.
3) Base address of 128.101.147.221
4) dynamic addressing from 147.222 to 147.240
$ORIGIN ee.umn.edu.
eecsk4f2	IN	A 128.101.147.221
; glue records like any other gateway ( multiple A records)
		IN	A 128.101.147.222
                [....]
		IN	A 128.101.147.240
		IN	HINFO KFPS-4	Native

$ORIGIN 147.101.128.IN-ADDR.ARPA.
221		IN	PTR	eecsk4f2.ee.umn.edu.
222		IN	PTR	eecsk4f2.ee.umn.edu.
[...]
241		IN	PTR	eecsk4f2.ee.umn.edu.

%nslookup -qt=ptr 128.101.147.240
	240.147.101.128.in-addr.arpa    host name = eecsk4f2.ee.umn.edu
%nslookup eecsk4f2.ee.umn.edu
	Name:    eecsk4f2.ee.umn.edu
	Address:  128.101.147.221

In this case the feature that Milo Medin mentioned would cause a lot
of problems.  With the example shown, the resolver would also
complain of nres_gethostbyaddr(): eecsk4f2.ee.umn.edu != 128.101.147.240
 

Tim Peiffer
-- 
-----------
Tim Peiffer				peiffer@cs.umn.edu 	or
Computer Science Dept			..!rutgers!umn-cs!peiffer
University of Minnesota