From owner-freebsd-net@freebsd.org Mon Mar 4 12:19:11 2019 Return-Path: Delivered-To: freebsd-net@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id CDD7C150F75D for ; Mon, 4 Mar 2019 12:19:11 +0000 (UTC) (envelope-from hausen@punkt.de) Received: from kagate.punkt.de (kagate.punkt.de [217.29.33.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id C1CCF96FD1 for ; Mon, 4 Mar 2019 12:19:10 +0000 (UTC) (envelope-from hausen@punkt.de) Received: from hugo10.ka.punkt.de (hugo10.ka.punkt.de [217.29.44.10]) by gate2.intern.punkt.de with ESMTP id x24CJ8AI046724; Mon, 4 Mar 2019 13:19:08 +0100 (CET) Received: from [217.29.44.250] ([217.29.44.250]) by hugo10.ka.punkt.de (8.14.2/8.14.2) with ESMTP id x24CJ8WO078876; Mon, 4 Mar 2019 13:19:08 +0100 (CET) (envelope-from hausen@punkt.de) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 11.5 \(3445.9.1\)) Subject: Re: TCP-forwarding with netcat - weird failures ... From: "Patrick M. Hausen" In-Reply-To: Date: Mon, 4 Mar 2019 13:19:08 +0100 Cc: FreeBSD Net Content-Transfer-Encoding: quoted-printable Message-Id: References: To: Eugene Grosbein X-Mailer: Apple Mail (2.3445.9.1) X-Rspamd-Queue-Id: C1CCF96FD1 X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org; spf=pass (mx1.freebsd.org: domain of hausen@punkt.de designates 217.29.33.131 as permitted sender) smtp.mailfrom=hausen@punkt.de X-Spamd-Result: default: False [-2.57 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-0.99)[-0.991,0]; FROM_HAS_DN(0.00)[]; R_SPF_ALLOW(-0.20)[+ip4:217.29.32.0/20]; MV_CASE(0.50)[]; MIME_GOOD(-0.10)[text/plain]; RCVD_TLS_LAST(0.00)[]; DMARC_NA(0.00)[punkt.de]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; RCVD_COUNT_THREE(0.00)[3]; TO_MATCH_ENVRCPT_SOME(0.00)[]; TO_DN_ALL(0.00)[]; MX_GOOD(-0.01)[cached: mailin.pluspunkthosting.de]; RCPT_COUNT_TWO(0.00)[2]; RCVD_IN_DNSWL_NONE(0.00)[131.33.29.217.list.dnswl.org : 127.0.10.0]; NEURAL_HAM_SHORT(-0.32)[-0.322,0]; IP_SCORE(-0.45)[ipnet: 217.29.32.0/20(-1.25), asn: 16188(-1.00), country: DE(-0.01)]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:16188, ipnet:217.29.32.0/20, country:DE]; MID_RHS_MATCH_FROM(0.00)[] X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 04 Mar 2019 12:19:12 -0000 Hi Eugene, > Am 04.03.2019 um 12:21 schrieb Eugene Grosbein : >=20 > 04.03.2019 17:43, Patrick M. Hausen wrote: >=20 >> Needless to say: doesn=E2=80=99t work. And no, it=E2=80=99s not the = obvious ARP caches. >> Connections can be established but then abort spontaneously without >> an observable pattern or reason. >=20 > Each "abort" of TCP connection has its own distinct reason: > TCP FIN or TCP RST or ICMP unreach or timeout etc. >=20 > You need to start collecting packet captures with "tcpdump -npw = file.pcap" > Without such details, noone can tell you what's your reason out of = hundreds possible. You are of course right. We=E2=80=99ll start running both VMs in = parallel on Wednesday to do exactly that. Kind regards Patrick --=20 punkt.de GmbH Internet - Dienstleistungen - Beratung Kaiserallee 13a Tel.: 0721 9109-0 Fax: -100 76133 Karlsruhe info@punkt.de http://punkt.de AG Mannheim 108285 Gf: Juergen Egeling