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Date:      Thu, 27 Feb 2020 10:18:20 -0800
From:      Chris <bsd-lists@BSDforge.com>
To:        freebsd-current <freebsd-current@freebsd.org>
Subject:   Re: lame reverse DNS?
Message-ID:  <479c542c953ec5d9edf96ea1d33940c3@udns.ultimatedns.net>
In-Reply-To: <20200227155655.GA1730@mail.bsd4all.net>

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On Thu, 27 Feb 2020 16:56:55 +0100 Herbert J=2E Skuhra herbert@gojira=2Eat said

> On Thu, Feb 27, 2020 at 10:31:59AM +0100, Kurt Jaeger wrote:
> > Hi!
> >=20
> > > 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)=2E Local unbound issue?
> >=20
> > That IPv6 has a valid reverse DNS record, so please try to investigate=2E
>=20
> Yes, I know=2E Otherwise it would fail permanently=2E
>=20
> - Postfix sends two standard queries (PTR) to local unbound within 5
> seconds (05:51:23 and 05:51:28)
> - Unbound sends multiple queries to 2610:1c0::1104 and 2610:1c0::1204
> without receiving a reply (05:51:23 - 05:51:41)
> - Unbound replies twice with Server failure (05:51:53)
>=20
> I have this issue only with [2610:1c1:1:606c::19:2]:
>=20
> # grep " connect from unknown" /var/log/maillog
> Feb 27 03:37:53 mail postfix/smtpd[93921]: connect from
> unknown[2610:1c1:1:606c::19:2]
> Feb 27 08:40:27 mail postfix/smtpd[33354]: connect from
> unknown[2610:1c1:1:606c::19:2]
> Feb 27 09:43:39 mail postfix/smtpd[41982]: connect from
> unknown[2610:1c1:1:606c::19:2]
> Feb 27 10:53:38 mail postfix/smtpd[4960]: connect from
> unknown[2610:1c1:1:606c::19:2]
> Feb 27 15:30:28 mail postfix/smtpd[87816]: connect from
> unknown[2610:1c1:1:606c::19:2]
> Feb 27 15:50:30 mail postfix/smtpd[98816]: connect from
> unknown[2610:1c1:1:606c::19:2]
>=20
> I've already set cache-min-ttl to 3600=2E FreeBSD=2Eorg uses ttl=3D60=2E Why?
> I'll try to set do-ip6=3Dno=2E Meanwhile I've whitelisted the IPv6 address
> in postfix=2E=20
>=20
FWIW I thought I might chime in here to report that I'm also seeing
*periodic* failures=2E
IOW lookups fail, but aren't *completely* fatal=2E :)

--Chris
FreeBSD 14=2E0-FUTURE #0=2E000 cray256

> --=20
> Herbert
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