From owner-freebsd-current  Sat Jan  4 12:48:51 2003
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Date: Sat, 04 Jan 2003 12:47:29 -0800
From: Terry Lambert <tlambert2@mindspring.com>
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To: Gregory Neil Shapiro <gshapiro@FreeBSD.ORG>
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Subject: Re: [resolution] Re: sendmail (Re: 5.0-RC2 informal PR: 90 sec sendmail  
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Gregory Neil Shapiro wrote:
> The latest FreeBSD 4.7-STABLE /etc/namedb/named.conf contains:
> 
> // RFC 3152
> zone "1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.IP6.ARPA" {
>         type master;
>         file "localhost-v6.rev";
> };
> 
> // RFC 1886 -- deprecated
> zone "1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.IP6.INT" {
>         type master;
>         file "localhost-v6.rev";
> };

Which is what's missing in the DNS where the reverse lookup fails;
likely, it's a bug that FreeBSD does not come with a caching DNS
server enabled by default, out of the box.

The FreeBSD library bug is that the /etc/hosts file entry:

	::1

is not canonized before being compared, for the reverse lookup.

It can probably be worked around by spcifying:

	0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.1

as the left hand side for the IPv6 loopback address, instead of ::1,
in the /etc/hosts file.  I don't recommend this, since it would not
encourage the author of the IPv6 resovler code to fix the bug they
introduced.

-- Terry

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