*BSD News Article 59334


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From: pauld@umbc.edu (Paul Danckaert)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: TCPDUMP and Kernel Drops
Date: 17 Jan 1996 15:58:33 -0500
Organization: University of Maryland, Baltimore County
Lines: 34
Message-ID: <4djntp$3d7@umbc7.umbc.edu>
NNTP-Posting-Host: f-umbc7.umbc.edu
NNTP-Posting-User: pauld


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!  

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
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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