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Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!news.mel.connect.com.au!munnari.OZ.AU!news.ecn.uoknor.edu!paladin.american.edu!zombie.ncsc.mil!news.mathworks.com!gatech!purdue!haven.umd.edu!news.umbc.edu!not-for-mail 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 --