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Date: Mon, 8 Sep 1997 13:54:33 -0500 (EST)
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Subject: bin/4497: Possible CIDR Reverse DNS Problem
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>Number:         4497
>Category:       bin
>Synopsis:       Reverse DNS fails for some CIDR *.IN-ADDR.ARPA domains
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Sep  8 12:00:01 PDT 1997
>Last-Modified:
>Originator:     C. Stephen Gunn
>Organization:
Wintek Corporation
>Release:        FreeBSD 2.2.2-RELEASE i386
>Environment:

	Any FreeBSD 2.2+ machine, including 2.2-R, 2.2.1-R and 2.2.2-R,
but not in 2.1.6-R. 

>Description:

   Binaries not staticly linked with libresolv.a fail to do correct
DNS lookups on certain (not sure which or why) IN-ADDR.ARPA domains.
Two CIDR blocks assigned to Wintek that do not work are:

   206.230.0.0 - 206.230.7.0

   208.13.56.0 - 208.13.63.0

>How-To-Repeat:

   Login's to FreeBSD-2.2 machines from the IP's on these subnets do
show in utmp entries as the IP address not the hostname. Traceroutes for
these subnets fail (sometimes) as well.

   Be advised the "dig", "nslookup" and similar tools give correct
responses since they were linked with the resolver that comes with the
bind distribution, not the one in libc.

>Fix:

>Audit-Trail:
>Unformatted: