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From: azrael@haydn.postech.ac.kr (Kim Tae Hyoung)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: TCPDUMP and Kernel Drops
Date: 23 Jan 1996 15:03:43 GMT
Organization: POSTECH, Pohang, Korea
Lines: 58
Message-ID: <4e2tcf$9pl@xpat.postech.ac.kr>
References: <4djntp$3d7@umbc7.umbc.edu>
NNTP-Posting-Host: haydn.postech.ac.kr
X-Newsreader: TIN [version 1.1 PL8]
Paul Danckaert (pauld@umbc.edu) wrote:
: Hi,
: I'm trying to do some network stat gathering with one of my FreeBSD Boxes,
: and it seems to be dropping alot of packets for no apparent reason. The
: other machine I've used for this (an AST notebook with ethernet PCMCIA
: card) never dropped packets, but this Pentium 100 drops them all over the
: floor.. and boy are they a mess to clean up!
I also run tcpdump with PCMCIA card. But in my case, PCMCIA card
device driver seems to have problem. It's that if use PCMCIA card,
tcpdump can't get all packets on ethernet.
I couldn't their solution. Anyway in the case of using PCMCIA card,
because tcpdump can't get all packets, tcpdump can't drop many packets.
It is just my thought.
: Doing a tcpdump for a few seconds, the control-c'ing it returns:
: 10254 packets received by filter
: 9784 packets dropped by kernel
: Is this normal? It currently has 2 3C509 ISA cards.. although currently
Well, I think it is normal.
: only one is active. (Running the network for the other one currently..)
: I just added the other card though, and it was doing the packet loss before
: I added it, so I don't think that is the problem.
: 2 3C5x9 board(s) on ISA found at 0x200 0x300
: ep0 at 0x300-0x30f irq 10 on isa
: ep0: aui/bnc/utp[*BNC*] address 00:a0:24:01:a0:1a irq 10
: ep1 at 0x200-0x20f irq 3 on isa
: ep1: aui/bnc/utp[*UTP*] address 00:a0:24:01:9f:24 irq 3
: As a side note, when I do a more restrictive dump, for example
: "tcpdump ip and dst port domain", it has a much lower drop rate.
: Thanks for any help..
: Paul
: --
--
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Snail Address : Computer Science Dept.
Pohang Institute of Science & Technology
San 31, Hyoja Dong Pohang,
Kyungbuk, 790-784 KOREA
Phone : 82-562-279-5655 (POSTECH, NDS Lab.)
E-mail : azrael@mozart.postech.ac.kr (141.223.92.1)
thkim@vision.postech.ac.kr (141.223.1.2)
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