looking for ethernet errors, collisions

[Chuck Swiger]

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.

> netstat -i on my desktop PC shows collisions on the ppp tun0
> interface. I haven't a clue what that means.

I admit that this one is a bit puzzling to me, too.

-- 
-Chuck