Date: Wed, 22 Dec 1999 11:37:42 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: Brad Knowles <brad@shub-internet.org> Cc: Joe Abley <jabley@patho.gen.nz>, Poul-Henning Kamp <phk@critter.freebsd.dk>, Garrett Wollman <wollman@khavrinen.lcs.mit.edu>, jlemon@FreeBSD.ORG, freebsd-current@FreeBSD.ORG Subject: Re: Odd TCP glitches in new currents Message-ID: <199912221937.LAA10414@apollo.backplane.com> References: <16589.945810831@critter.freebsd.dk> <199912212123.NAA02780@apollo.backplane.com> <19991222200017.A25228@patho.gen.nz> <v04220802b486491ca1af@[195.238.1.121]>
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:> clueful person bitten by this: :> :> hard-wire your duplex setting on your machine and also on the switch : : If you check <http://www.backplane.com/diablo/hard.html>; and :scroll down to the "Network:" section (from the looks of things, :written sometime back in 1997 or perhaps 1998), you'll see that Matt :has been well aware of this problem for some time. : : That's not to say that he might have forgotten his own advice on :this issue, just that he is (or should be ;-) well aware of it. : : : That said, I have to admit that I have yet to be bitten by this :problem, and I have not (yet) configured machines & switches at this :site to forcibly select a particular media speed and plexicity. : :-- :Brad Knowles <brad@shub-internet.org> <http://www.shub-internet.org/brad/>; : <http://wwwkeys.pgp.net:11371/pks/lookup?op=get&search=0xE38CCEF1>; That's less of a problem as boards have started to conform better, but I definitely checked it - full-duplex worked fine (I could push over 15 MBits aggregate). My packet loss occured with both half and full duplex. I finally tracked it down. The loss is occuring in the link between two of my switches. The link goes across my apartment - about 60 feet of Cat-5 cable. That should be well within spec (you are supposed to be able to do 100 meters) but it causes packet loss. The switches autonegotiate full-duplex for the link (and I verified that it's actually running at full duplex), but that's where the packet loss occurs. Very weird. I was finally able to fix it by dropping in a 10BaseT hub to force the switches to negotiate 10BaseT across the link. Maybe my cable is damaged or something. I'll run a second cable to see if that's the problem or whether. The second switch is a LinkSys. I have a D-Link near my servers and a LinkSys near my workstation. -Matt Matthew Dillon <dillon@backplane.com> To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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