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Date: Wed, 23 May 2007 19:55:07 -0400
From: Javier Henderson <javier@kjsl.com>
To: RW <fbsd06@mlists.homeunix.com>
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Subject: Re: looking for ethernet errors, collisions
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On Thu, 24 May 2007 00:25:43 +0100, RW wrote:
> On Sat, 19 May 2007 21:10:25 -0400
> "Michael P. Soulier" <msoulier@digitaltorque.ca> wrote:
> 
>> On 17/05/07 Ted Mittelstaedt said:
>> 
>>> Note that error counters are often bogus because so
>>> many cards today filter errors out in hardware, long before
>>> the OS driver gets them.
>> 
>> 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.

You can have collisions if the duplex settings don't match.

-jav