From owner-freebsd-net@freebsd.org Tue Feb 6 17:38:12 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 749BBEEC798 for ; Tue, 6 Feb 2018 17:38:12 +0000 (UTC) (envelope-from davida@truespeed.com) Received: from mail.truespeed.com (mail.truespeed.com [31.210.26.210]) by mx1.freebsd.org (Postfix) with ESMTP id 0D3A575B52 for ; Tue, 6 Feb 2018 17:38:11 +0000 (UTC) (envelope-from davida@truespeed.com) Received: from dspam.truespeed.com (localhost [127.0.0.1]) by mail.truespeed.com (Postfix) with SMTP id D00C424B9B7 for ; Tue, 6 Feb 2018 17:29:23 +0000 (UTC) Received: from [192.168.2.73] (unknown [185.147.184.254]) (Authenticated sender: davida@truespeed.com) by mail.truespeed.com (Postfix) with ESMTPSA id 7626A24B9AA for ; Tue, 6 Feb 2018 17:29:23 +0000 (UTC) From: David Athay Mime-Version: 1.0 (Mac OS X Mail 10.3 \(3273\)) Subject: tcpdump filter not functioning correctly with igb on FreeBSD 11.1 Message-Id: <95AA0EAB-B3D6-4E68-83B2-914894D6FB90@truespeed.com> Date: Tue, 6 Feb 2018 17:29:23 +0000 To: freebsd-net@freebsd.org X-Mailer: Apple Mail (2.3273) Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.25 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 17:38:12 -0000 I am running tcpdump -ni igb0 with a filter, and I see some weird = results. If I use =E2=80=98not=E2=80=99 with host or port then it shows only = those hosts or ports, and if I don=E2=80=99t use not, and just use = host=E2=80=99 or =E2=80=98port=E2=80=99 it filters them out as if I had = used =E2=80=98not=E2=80=99. tcpdump -ni igb0 not port 22 tcpdump: verbose output suppressed, use -v or -vv for full protocol = decode listening on igb0, link-type EN10MB (Ethernet), capture size 262144 = bytes 17:18:08.863067 IP X.X.X.X.22 > Y.Y.Y.Y.50893: Flags [P.], seq = 521876235:521876423, ack 2066644163, win 1026, options [nop,nop,TS val = 554193435 ecr 716910521], length 188 17:18:08.864772 IP Y.Y.Y.Y.50893 > X.X.X.X.22: Flags [.], ack 0, win = 23656, options [nop,nop,TS val 716910525 ecr 554193434], length 0 17:18:08.866353 IP Y.Y.Y.Y.50893 > X.X.X.X.22: Flags [.], ack 188, win = 23651, options [nop,nop,TS val 716910526 ecr 554193435], length 0 tcpdump -ni igb0 not host X.X.X.X tcpdump: verbose output suppressed, use -v or -vv for full protocol = decode listening on igb0, link-type EN10MB (Ethernet), capture size 262144 = bytes 17:20:21.901147 IP X.X.X.X.22 > Y.Y.Y.Y.50893: Flags [P.], seq = 521879011:521879199, ack 2066645503, win 1026, options [nop,nop,TS val = 554326474 ecr 717043360], length 188 17:20:21.902970 IP Y.Y.Y.Y.50893 > X.X.X.X.22: Flags [.], ack 0, win = 23656, options [nop,nop,TS val 717043364 ecr 554326472], length 0 17:20:21.903364 IP Y.Y.Y.Y.50893 > X.X.X.X.22: Flags [.], ack 188, win = 23650, options [nop,nop,TS val 717043364 ecr 554326474], length 0 tcpdump -ni igb0 host X.X.X.X 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 55 packets received by filter 0 packets dropped by kernel tcpdump -ni igb0 port 22 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 408 packets received by filter 0 packets dropped by kernel Seems to work fine on our FreeBSD 10.3 servers that use igb, and = doesn=E2=80=99t happen on FreeBSD 11.1 servers that use bge. Can anyone explain what is happening? =E2=80=94 David Athay Senior DevOps Engineer TrueSpeed Communications Ltd.=20