Re: RE: Sniffing out a firewall problem

[Barney Wolff <barney () databus com>]

On Sun, Nov 04, 2001 at 06:38:36AM -0800, Gregory Hicks wrote:
> Half duplex?  If the ratio of coll/total is 2% or less, Great!  More
> than 10%?  You've got a problem.

This is at best half true.  What is true is that a broken NIC or hub can
cause lots of collisions.  But so can a heavy load when everything is
functioning normally.  I have seen an Ethernet where collisions were
over 100%, for months at a time, but nothing was broken and thruput was
quite good.  When NICs and hub are in spec, a collision wastes very
little time compared to the average frame time.

These days, there is little reason to run hubs rather than switches, so
collisions are largely part of history.
-- 
Barney Wolff

"Nonetheless, ease and peace had left this people still curiously tough.
They were, if it came to it, difficult to daunt or to kill; and they were,
perhaps, so unwearyingly fond of good things not least because they could,
when put to it, do without them, and could survive rough handling by grief,
foe, or weather in a way that astonished those who did not know them well
and looked no further than their bellies and their well-fed faces." J.R.R.T.
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