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Path: sserve!newshost.anu.edu.au!munnari.oz.au!news.Hawaii.Edu!ames!agate!spool.mu.edu!carroll1.cc.edu!carroll1.cc.edu!not-for-mail From: sander@carroll1.cc.edu (Scott B. Anderson) Newsgroups: comp.os.386bsd.questions Subject: Duplicate packet errors under NetBSD 0.9 Date: 19 Sep 1993 03:35:17 -0500 Organization: The Carroll College poorly-installed InterNetNews site Lines: 18 Message-ID: <27h5k5$o1i@carroll1.cc.edu> NNTP-Posting-Host: carroll1.cc.edu Summary: ping me with less than 122byte packets and you'll get duplicate packet Keywords: ping blah I compiled a kernel with the bpf filter today as well as KTRACE, NFSSERVER and no SCSI at all. I also configured in bpfilter3 as a device since I like having the filter. Shortly after doing this I noticed that the ethernet was sluggish but thought little of it. Then about an hour later, the whole campus net crashed. :) I wondered why, reset the hubs etc and all seemed cool. Then I came back into my room. I had to reboot to get back on the net. (strange I thought) So then I decided to see what my lag to the local network was... I pinged the cisco router. I got back about 30 packets for each ping sequence. all but one a duplicate packet. After playing around, I found that 123 byte's was the cutoff point where packets did or did not duplicate. Could bpf be broken or something? my router, other hosts, network, and ifconfig lines are all working. Scott Anderson, a confused soul. sander@hastur.cc.edu