This article is from a FAQ concerning SCO operating systems. While some of the information may be applicable to any OS, or any Unix or Linux OS, it may be specific to SCO Xenix, Open There is lots of Linux, Mac OS X and general Unix info elsewhere on this site: Search this site is the best way to find anything.
Collisions are a normal event on an ethernet network- that's the way Ethernet works- and the more hosts you have, the more collisions you have (unless you use switches). So it's the percentage of collisions that indicates a problem- rough rule of thumb says 3% or so is acceptable, but this depends on your lan and the type of work done: if you had 6 PC's and a server doing typical data input work, I'd expect to see near 0 collisions. On the other hand, if you had a large number of hosts all busy transferring data files back and forth, I'd expect to see a lot more..
This article was written when hubs were common and switches were rare. You shouldn't see collisions now.
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One of the main causes of the fall of the Roman Empire was that, lacking zero, they had no way to indicate successful termination of their C programs. (Robert Firth)