Date: Tue, 6 Feb 2018 21:03:12 +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: <E149211C-9207-4162-950D-1BA788AA3A5F@truespeed.com> In-Reply-To: <5A7A1657.4050706@grosbein.net> References: <95AA0EAB-B3D6-4E68-83B2-914894D6FB90@truespeed.com> <5A7A1657.4050706@grosbein.net>
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I was originally using 11.1-RELEASE but I have since updated to 11-STABLE. Weirdness still persists $ tcpdump --version tcpdump version 4.9.2 libpcap version 1.8.1 OpenSSL 1.0.2n-freebsd 7 Dec 2017 $ uname -aUK FreeBSD s5.pkfm.banes 11.1-STABLE FreeBSD 11.1-STABLE #2 r328930: Tue Feb 6 16:05:59 GMT 2018 root@s5.pkfm.banes:/usr/obj/usr/src/sys/TRUESPEED amd64 1101509 1101509 — David Athay Senior DevOps Engineer TrueSpeed Communications Ltd. > On 6 Feb 2018, at 20:55, Eugene Grosbein <eugen@grosbein.net> wrote: > > 07.02.2018 0:29, David Athay wrote: > >> I am running tcpdump -ni igb0 with a filter, and I see some weird results. >> >> If I use ‘not’ with host or port then it shows only those hosts or ports, and if I don’t use not, and just use host’ or ‘port’ it filters them out as if I had used ‘not’. >> >> 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’t happen on FreeBSD 11.1 servers that use bge. >> >> Can anyone explain what is happening? > > Please show output of: > > tcpdump --version > uname -aUK > >
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