Date: Mon, 29 Jan 2001 09:12:26 -0800 From: "Kevin Oberman" <oberman@es.net> To: "John Bolster" <j.bol@gte.net> Cc: "Freebsd-Questions@Freebsd. Org" <freebsd-questions@FreeBSD.ORG> Subject: Re: collisions Message-ID: <200101291712.f0THCQc17335@ptavv.es.net> In-Reply-To: Your message of "Mon, 29 Jan 2001 03:22:55 EST." <NEBBKLANMLAKACFKNODOOEAACPAA.j.bol@gte.net>
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> From: "John Bolster" <j.bol@gte.net> > Date: Mon, 29 Jan 2001 03:22:55 -0500 > Sender: owner-freebsd-questions@FreeBSD.ORG > > Hello all, > > In my daily run output email I get each night at 2am, there is the following > section which I don't completely understand. What is the 'coll' column? Is > this something I should be doing something about? > > Network interface status: > Name Mtu Network Address Ipkts Ierrs Opkts Oerrs Coll > xl0 1500 <Link#1> 00:01:02:59:fc:86 173543 0 159240 0 0 > xl0 1500 10/24 alf 173543 0 159240 0 0 > xl0 1500 fe80:1::201 fe80:1::201:2ff:f 173543 0 159240 0 0 > xl1 1500 <Link#2> 00:01:02:74:01:f7 372854 0 368437 0 559 > xl1 1500 207.90.20.168 alf 372854 0 368437 0 559 > xl1 1500 fe80:2::201 fe80:2::201:2ff:f 372854 0 368437 0 559 > sl0* 552 <Link#3> 0 0 0 0 0 > ppp0* 1500 <Link#4> 0 0 0 0 0 > lo0 16384 <Link#5> 43636 0 43636 0 0 > lo0 16384 fe80:5::1 fe80:5::1 43636 0 43636 0 0 > lo0 16384 localhost.c ::1 43636 0 43636 0 0 > lo0 16384 127 localhost 43636 0 43636 0 0 Collisions are the normal method of Ethernet flow control. They happen and are of little concern in most cases. Depending on the timings of the network, they can be VERY common, but most "private" Ethernets are pretty small; often just a few feet in diameter. This keeps them down a bit. If you are seeing other errors it is possible that there is a configuration problem, but what you are seeing is normal and nothing to worry about. "Collision" sounds ominous, but it's really not. Certainly 559 out of over 350K packets is not anything to worry about. R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: oberman@es.net Phone: +1 510 486-8634 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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