From owner-freebsd-current@freebsd.org  Thu Feb 27 09:32:12 2020
Return-Path: <owner-freebsd-current@freebsd.org>
Delivered-To: freebsd-current@mailman.nyi.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1])
 by mailman.nyi.freebsd.org (Postfix) with ESMTP id 9676A25A3A6
 for <freebsd-current@mailman.nyi.freebsd.org>;
 Thu, 27 Feb 2020 09:32:12 +0000 (UTC) (envelope-from pi@freebsd.org)
Received: from mailman.nyi.freebsd.org (unknown [127.0.1.3])
 by mx1.freebsd.org (Postfix) with ESMTP id 48SnWJ2Cm2z4LyN
 for <freebsd-current@freebsd.org>; Thu, 27 Feb 2020 09:32:12 +0000 (UTC)
 (envelope-from pi@freebsd.org)
Received: by mailman.nyi.freebsd.org (Postfix)
 id 2AF8925A3A5; Thu, 27 Feb 2020 09:32:12 +0000 (UTC)
Delivered-To: current@mailman.nyi.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1])
 by mailman.nyi.freebsd.org (Postfix) with ESMTP id 2AA1A25A3A4
 for <current@mailman.nyi.freebsd.org>; Thu, 27 Feb 2020 09:32:12 +0000 (UTC)
 (envelope-from pi@freebsd.org)
Received: from home.opsec.eu (home.opsec.eu [IPv6:2001:14f8:200::1])
 (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)
 server-signature RSA-PSS (4096 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id 48SnWH3mllz4Lwf
 for <current@freebsd.org>; Thu, 27 Feb 2020 09:32:11 +0000 (UTC)
 (envelope-from pi@freebsd.org)
Received: from pi by home.opsec.eu with local (Exim 4.92.3 (FreeBSD))
 (envelope-from <pi@freebsd.org>)
 id 1j7FWR-000Hty-Tp; Thu, 27 Feb 2020 10:31:59 +0100
Date: Thu, 27 Feb 2020 10:31:59 +0100
From: Kurt Jaeger <pi@freebsd.org>
To: "Herbert J. Skuhra" <herbert@gojira.at>
Cc: current@freebsd.org, Michael Butler <imb@protected-networks.net>
Subject: Re: lame reverse DNS?
Message-ID: <20200227093159.GS37073@home.opsec.eu>
References: <db42c2a5-f42e-ee4a-5cf8-0136e0867105@protected-networks.net>
 <8736axm50b.wl-herbert@gojira.at>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <8736axm50b.wl-herbert@gojira.at>
X-Rspamd-Queue-Id: 48SnWH3mllz4Lwf
X-Spamd-Bar: -
Authentication-Results: mx1.freebsd.org;
	none
X-Spamd-Result: default: False [-1.91 / 15.00];
 local_wl_from(0.00)[freebsd.org];
 NEURAL_HAM_MEDIUM(-0.92)[-0.922,0];
 NEURAL_HAM_LONG(-0.99)[-0.992,0];
 ASN(0.00)[asn:12502, ipnet:2001:14f8::/32, country:DE]
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
 <freebsd-current.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-current>, 
 <mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current/>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-current>, 
 <mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 27 Feb 2020 09:32:12 -0000

Hi!

> The problem has been resolved but I still sometimes see "connect from
> unknown[2610:1c1:1:606c::19:2]" in the maillog (today: 6 of 131
> connections). Local unbound issue?

That IPv6 has a valid reverse DNS record, so please try to investigate.

Something like the output from:

dig +trace -t ptr 2.0.0.0.9.1.0.0.0.0.0.0.0.0.0.0.c.6.0.6.1.0.0.0.1.c.1.0.0.1.6.2.ip6.arpa

-- 
pi@opsec.eu            +49 171 3101372                    Now what ?