Date: Sat, 27 Sep 1997 19:05:01 +0200 From: sthaug@nethelp.no To: rgrimes@GndRsh.aac.dev.com Cc: hackers@FreeBSD.ORG, stable@FreeBSD.ORG Subject: Re: 'fxp' driver/hardware lossage (was Re: Alexander B. Povol's mail) Message-ID: <18012.875379901@verdi.nethelp.no> In-Reply-To: Your message of "Sat, 27 Sep 1997 09:47:15 -0700 (PDT)" References: <199709271647.JAA20293@GndRsh.aac.dev.com>
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> > Nope. A hub doesn't do anything with collisions - it just propagates > > them bit by bit. The NICs sense the collision. > > Better go think so more about that... it depends on the hub! Some hubs > that have partitioning ability will automagically partition out someone > who starts to transmit if the hub is sending data out that port, this > is called autopartitioning and is used to stop baligerant (sp) mau's > or Jabberers(sp). Sure - I agree it depends on the hub. But the basic task of the hub is to propagate everything bit by bit - including collisions. And if you buy a noname cheapie hub, it won't do much more than that. > If you want something that really tries to ``prevent'' this you want > a switch and not a hub, and you want full-duplex non-simplex NIC cards > in every box connected to that switch, and no I'm not just talking > about 100Base stuff here, it applies to both 10 and 100Base ethernet > over TP. Yup. But for normal, half-duplex Ethernet you *don't* want to prevent collisions :-) Steinar Haug, Nethelp consulting, sthaug@nethelp.no
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