Date: Thu, 24 May 2007 09:52:58 +0100 From: Tom Judge <tom@tomjudge.com> To: Chuck Swiger <cswiger@mac.com> Cc: RW <fbsd06@mlists.homeunix.com>, freebsd-questions@freebsd.org Subject: Re: looking for ethernet errors, collisions Message-ID: <4655526A.5010703@tomjudge.com> In-Reply-To: <404317EA-2E8C-45CD-9418-6493610D4D69@mac.com> References: <20070517152529.GA15636@tigger.digitaltorque.ca> <BMEDLGAENEKCJFGODFOCMEBCCAAA.tedm@toybox.placo.com> <20070520011025.GX11625@tigger.digitaltorque.ca> <20070524002543.7f6d6b34@gumby.homeunix.com> <404317EA-2E8C-45CD-9418-6493610D4D69@mac.com>
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Chuck Swiger wrote: > On May 23, 2007, at 4:25 PM, RW wrote: >>> Well, there are plenty there on my sis0 interface (internal). >>> >>> [msoulier@kanga ~]$ netstat -i >>> Name Mtu Network Address Ipkts Ierrs Opkts >>> Oerrs Coll >>> sis0 1500 <Link#1> 00:0a:e6:4a:56:c2 37989565 3980 36808783 >>> 5749 6492857 >>> sis0 1500 192.168.1 kanga 12380344 - >>> 9255757 - >> >> What are collisions in this context? >> >> Traditional ethernet collisions aren't possible on modern hardware, >> since there's never more than one output writing to each twisted-pair. > > Even though all modern NICs will happily do full-duplex operation when > connected via a switch, people still use hubs rather than switches, > sometimes.... :-) You can still get ethernet collisions on a hub. > In theory it is also possible to have collisions using a switch when the switches switching backplane is flooded. Tom
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