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Date:      Mon, 10 Jan 2000 09:25:11 -0600
From:      Dan Nelson <dnelson@emsphone.com>
To:        Wessel van Norel <maillist@Wit397401.student.utwente.nl>
Cc:        freebsd-questions@FreeBSD.ORG
Subject:   Re: collisions more then half of total traffic?
Message-ID:  <20000110092511.A55853@dan.emsphone.com>
In-Reply-To: <Pine.BSF.4.10.10001101536510.94193-100000@Wit397401.student.utwente.nl>; from "Wessel van Norel" on Mon Jan 10 16:03:01 GMT 2000
References:  <Pine.BSF.4.10.10001101536510.94193-100000@Wit397401.student.utwente.nl>

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In the last episode (Jan 10), Wessel van Norel said:
> I'm having problems with my internal network. I've an 3com 3c905B-TX card
> on the external network (xl0)  and a NE2000 PCI Ethernet (RealTek 8029) on
> the internal network (ed2) 
> netstat -i give's me the following information:
> Name	Mtu	Network	Address	Ipkts		Ierrs	Opkts	Oerrs	Coll
> ed2	1500	<Link>	00.c0	2896726		0	4738448	4	1639672
> ed2	1500	10	intern	2896726		0	4738448	4	1639672
> xl0	1500	<Link>	00.10	24522846	76	3253900	4	0
> xl0	1500	130.89	wit397	24522846	76	3253900	4	0
> lo0	16384	<Link>		24250		0	24250	0	0
> lo0	16384	127	localh	24250		0	24250	0	0

Actually, your collisions are 1639672/4738448 = 35% of your total
traffic.  Also note that collisions do not represent dropped packets;
you had 4 of those at most.  A collision simply delays the packet by a
few microseconds (this is all done in the card's hardware so its fast).


-- 
	Dan Nelson
	dnelson@emsphone.com


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