* Re: [Frank Ch. Eigler] Re: friend reports blocked IP address
[not found] <oreegbosct.fsf@lxoliva.fsfla.org>
@ 2021-03-19 21:57 ` lkcl
2021-03-19 22:01 ` Frank Ch. Eigler
0 siblings, 1 reply; 3+ messages in thread
From: lkcl @ 2021-03-19 21:57 UTC (permalink / raw)
To: Alexandre Oliva, fche, overseers
the setup of sourceware.org has been triggering exim4 to put warnings
such as the following into /var/log/exim4/mainlog:
2021-03-19 20:01:35 no IP address found for host
ip-8-43-85-97.sourceware.org (during SMTP connection from
[8.43.85.97])
i have fail2ban set up to monitor for such "no IP address" messages,
and enough of those will trigger a full-on recidive ban for at least 2
weeks. this is what you hit, Frank, so apologies, the tests you did
would have been invalid (expected behaviour).
i've since whitelisted 8.43.85.97 (as of 3 hours ago) so any further
tests you do should succeed to 217.147.94.29
the outgoing connection from postfix running on sourceware.org appears
to be reporting its hostname as "ip-8-43-85-97.sourceware.org". this
is a hostname that doesn't exist.
where exim4, as the recipient incoming connection, is getting that
host name from, i couldn't tell you. i don't know if it's making that
up (unlikely), or if it's part of the HELO from postfix (plausible),
or other.
l.
On Fri, Mar 19, 2021 at 7:31 PM Alexandre Oliva <oliva@gnu.org> wrote:
>
> FYI
(thx)
>
>
>
> ---------- Forwarded message ----------
> From: "Frank Ch. Eigler" <fche@redhat.com>
> To: Overseers mailing list <overseers@sourceware.org>
> Cc: Alexandre Oliva <oliva@gnu.org>
> Bcc:
> Date: Fri, 19 Mar 2021 11:26:13 -0400
> Subject: Re: friend reports blocked IP address
> Hi -
> In the postfix logs, I see numerous errors like:
>
> Mar 19 15:22:05 server2 postfix/smtp[3889716]: connect to smtp.lkcl.net[2002:2eeb:e34d::1]:25: Connection timed out
> Mar 19 15:22:35 server2 postfix/smtp[3889716]: connect to smtp.lkcl.net[217.147.94.29]:25: Connection timed out
> Mar 19 15:23:05 server2 postfix/smtp[3889716]: connect to smtp2.lkcl.net[217.147.94.29]:25: Connection timed out
> Mar 19 15:23:05 server2 postfix/smtp[3889716]: 7F05B3857C60: to=<lkcl@lkcl.net>, relay=none, delay=357781, delays=357691/0/90/0, dsn=4.4.1, status=deferred (connect to smtp2.lkcl.net[217.147.94.29]:25: Connection timed out)
>
> and a local outgoing telnet confirms inability to reach that host on
> port 25, but I don't think it's anything we're doing.
>
>
> - FChE
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Frank Ch. Eigler] Re: friend reports blocked IP address
2021-03-19 21:57 ` [Frank Ch. Eigler] Re: friend reports blocked IP address lkcl
@ 2021-03-19 22:01 ` Frank Ch. Eigler
2021-03-19 22:04 ` lkcl
0 siblings, 1 reply; 3+ messages in thread
From: Frank Ch. Eigler @ 2021-03-19 22:01 UTC (permalink / raw)
To: Overseers mailing list; +Cc: Alexandre Oliva, fche, lkcl
Hi -
> 2021-03-19 20:01:35 no IP address found for host
> ip-8-43-85-97.sourceware.org (during SMTP connection from
> [8.43.85.97])
That seems to come from a bad/dupe PTR record from the RH DNS servers
that serve the address zones. Added a forward record from sourceware.org
to let that resolve too.
- FChE
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Frank Ch. Eigler] Re: friend reports blocked IP address
2021-03-19 22:01 ` Frank Ch. Eigler
@ 2021-03-19 22:04 ` lkcl
0 siblings, 0 replies; 3+ messages in thread
From: lkcl @ 2021-03-19 22:04 UTC (permalink / raw)
To: Frank Ch. Eigler; +Cc: Overseers mailing list, Alexandre Oliva
On Fri, Mar 19, 2021 at 10:01 PM Frank Ch. Eigler <fche@redhat.com> wrote:
> That seems to come from a bad/dupe PTR record from the RH DNS servers
> that serve the address zones. Added a forward record from sourceware.org
> to let that resolve too.
# host ip-8-43-85-97.sourceware.org
ip-8-43-85-97.sourceware.org A 8.43.85.97
that was quick!
^ permalink raw reply [flat|nested] 3+ messages in thread
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2021-03-19 21:57 ` [Frank Ch. Eigler] Re: friend reports blocked IP address lkcl
2021-03-19 22:01 ` Frank Ch. Eigler
2021-03-19 22:04 ` lkcl
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