From owner-freebsd-net@freebsd.org Tue Feb 6 22:19:17 2018 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 A7CAFF0C8B9 for ; Tue, 6 Feb 2018 22:19:17 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from hz.grosbein.net (hz.grosbein.net [78.47.246.247]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "hz.grosbein.net", Issuer "hz.grosbein.net" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 39CF085A67 for ; Tue, 6 Feb 2018 22:19:16 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from eg.sd.rdtc.ru (root@eg.sd.rdtc.ru [62.231.161.221] (may be forged)) by hz.grosbein.net (8.15.2/8.15.2) with ESMTPS id w16MJARL063895 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 6 Feb 2018 23:19:10 +0100 (CET) (envelope-from eugen@grosbein.net) X-Envelope-From: eugen@grosbein.net X-Envelope-To: davida@truespeed.com Received: from [10.58.0.4] ([10.58.0.4]) by eg.sd.rdtc.ru (8.15.2/8.15.2) with ESMTPS id w16MJ6MK055485 (version=TLSv1.2 cipher=DHE-RSA-AES128-SHA bits=128 verify=NOT); Wed, 7 Feb 2018 05:19:06 +0700 (+07) (envelope-from eugen@grosbein.net) Subject: Re: tcpdump filter not functioning correctly with igb on FreeBSD 11.1 To: David Athay References: <95AA0EAB-B3D6-4E68-83B2-914894D6FB90@truespeed.com> <5A7A1657.4050706@grosbein.net> <5A7A19DD.6050400@grosbein.net> <64C4AA32-5A49-4D6F-B7A7-93CDB0E59F09@truespeed.com> <5A7A24DC.0@grosbein.net> <293C7809-A1AE-4040-8963-F9A6802CB898@truespeed.com> Cc: freebsd-net@freebsd.org From: Eugene Grosbein Message-ID: <5A7A29D6.3050307@grosbein.net> Date: Wed, 7 Feb 2018 05:19:02 +0700 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.7.2 MIME-Version: 1.0 In-Reply-To: <293C7809-A1AE-4040-8963-F9A6802CB898@truespeed.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=2.2 required=5.0 tests=BAYES_00, LOCAL_FROM, RDNS_NONE autolearn=no autolearn_force=no version=3.4.1 X-Spam-Report: * -2.3 BAYES_00 BODY: Bayes spam probability is 0 to 1% * [score: 0.0000] * 2.6 LOCAL_FROM From my domains * 1.9 RDNS_NONE Delivered to internal network by a host with no rDNS X-Spam-Level: ** X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on hz.grosbein.net X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 06 Feb 2018 22:19:17 -0000 07.02.2018 5:10, David Athay wrote: > # /usr/local/sbin/tcpdump --version > tcpdump version 4.9.0 > libpcap version 1.8.1 > OpenSSL 1.0.2n-freebsd 7 Dec 2017 > > Still same weirdness. > > # /usr/local/sbin/tcpdump -ni igb0 not port 22 | less > tcpdump: verbose output suppressed, use -v or -vv for full protocol decode > listening on igb0, link-type EN10MB (Ethernet), capture size 262144 bytes > 22:03:28.941870 IP X.X.X.X.22 > 77.100.156.Y.52743: Flags [P.], seq 417632730:417632918, ack 196056259, win 1026, options [nop,nop,TS val 602028380 ecr 730520401], length 188 > 22:03:28.969328 IP 77.100.156.Y.52743 > X.X.X.X.22: Flags [.], ack 0, win 4093, options [nop,nop,TS val 730520446 ecr 602028380], length 0 > 22:03:28.969342 IP 77.100.156.Y.52743 > X.X.X.X.22: Flags [.], ack 188, win 4090, options [nop,nop,TS val 730520447 ecr 602028380], length 0 > > # /usr/local/sbin/tcpdump -ni igb0 not host 77.100.156.Y | less > tcpdump: verbose output suppressed, use -v or -vv for full protocol decode > listening on igb0, link-type EN10MB (Ethernet), capture size 262144 bytes > 22:05:58.807570 IP X.X.X.X.22 > 77.100.156.Y.52743: Flags [P.], seq 418507510:418507698, ack 196060707, win 1026, options [nop,nop,TS val 602178246 ecr 730669128], length 188 > 22:05:58.831887 IP 77.100.156.Y.52743 > X.X.X.X.22: Flags [.], ack 0, win 4093, options [nop,nop,TS val 730669159 ecr 602178246], length 0 > 22:05:58.838645 IP 77.100.156.Y.52743 > X.X.X.X.22: Flags [.], ack 188, win 4090, options [nop,nop,TS val 730669159 ecr 602178246], length 0 > > # /usr/local/sbin/tcpdump -ni igb0 host 77.100.156.Y > tcpdump: verbose output suppressed, use -v or -vv for full protocol decode > listening on igb0, link-type EN10MB (Ethernet), capture size 262144 bytes > ^C > 0 packets captured > 140 packets received by filter > 0 packets dropped by kernel 802.1Q vlan header can be a reason for exactly such behaviour. Please add -e flag to tcpdump flags and post output again.