Date: Tue, 6 Feb 2018 22:26:05 +0000 From: David Athay <davida@truespeed.com> To: Eugene Grosbein <eugen@grosbein.net> Cc: freebsd-net@freebsd.org Subject: Re: tcpdump filter not functioning correctly with igb on FreeBSD 11.1 Message-ID: <DBA7BD66-CDB7-4FF2-88E4-EBC2B71E1F3E@truespeed.com> In-Reply-To: <5A7A29D6.3050307@grosbein.net> References: <95AA0EAB-B3D6-4E68-83B2-914894D6FB90@truespeed.com> <5A7A1657.4050706@grosbein.net> <E149211C-9207-4162-950D-1BA788AA3A5F@truespeed.com> <5A7A19DD.6050400@grosbein.net> <64C4AA32-5A49-4D6F-B7A7-93CDB0E59F09@truespeed.com> <5A7A24DC.0@grosbein.net> <293C7809-A1AE-4040-8963-F9A6802CB898@truespeed.com> <5A7A29D6.3050307@grosbein.net>
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> On 6 Feb 2018, at 22:19, Eugene Grosbein <eugen@grosbein.net> wrote: >=20 > 07.02.2018 5:10, David Athay wrote: >=20 >> # /usr/local/sbin/tcpdump --version >> tcpdump version 4.9.0 >> libpcap version 1.8.1 >> OpenSSL 1.0.2n-freebsd 7 Dec 2017 >>=20 >> Still same weirdness. >>=20 >> # /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 >>=20 >> # /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 >>=20 >> # /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 >=20 > 802.1Q vlan header can be a reason for exactly such behaviour. > Please add -e flag to tcpdump flags and post output again. >=20 # /usr/local/sbin/tcpdump -eni 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 22:19:25.589577 ac:1f:6b:13:a2:nn > 10:cd:ae:de:e9:nn, ethertype 802.1Q = (0x8100), length 258: vlan 10, p 0, ethertype IPv4, X.X.X.X.22 > = 77.100.156.Y.52743: Flags [P.], seq 418521610:418521798, ack 196067467, = win 1026, options [nop,nop,TS val 602985028 ecr 731470580], length 188 22:19:25.619924 10:cd:ae:de:e9:nn > ac:1f:6b:13:a2:nn, ethertype 802.1Q = (0x8100), length 70: vlan 10, p 0, ethertype IPv4, 77.100.156.Y.52743 > = X.X.X.X.22: Flags [.], ack 4294967252, win 4094, options [nop,nop,TS val = 731470613 ecr 602985027], length 0 22:19:25.626834 10:cd:ae:de:e9:nn > ac:1f:6b:13:a2:nn, ethertype 802.1Q = (0x8100), length 70: vlan 10, p 0, ethertype IPv4, 77.100.156.Y.52743 > = X.X.X.X.22: Flags [.], ack 0, win 4093, options [nop,nop,TS val = 731470613 ecr 602985028], length 0
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