looking for ethernet errors, collisions

[Tom Judge]

Chuck Swiger wrote:
> On May 23, 2007, at 4:25 PM, RW wrote:
>>> Well, there are plenty there on my sis0 interface (internal).
>>>
>>> [msoulier at 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