I like that "plain English" part; the computer people I know do not normally
speak plain English.
Actually, I've had some fascinating (to a computer person) times with a
Sniffer and retransmissions. My aging DSS' expert analysis feature does
allow for quick 'drill downs', and is vastly superior, still, to Microsoft's
useful network monitor.
Using this, one of my more interesting finds was with an I/C seismometer
using IP to transmit information packets to a mini-cpu down at the
university. Had a 'retransmit' error every three packets. The geologist
were happy, the data was transferred and processed ok. The Sniffer's
increments of red numbers, however, were quite annoying.
The 'retransmitted' packets were different sizes. The sequence number from
the instrument side, however, did not change. This, I believe, is one of
the 'definitions' of a retransmit. This was not, however, an error
condition, except in the protocol violation.
As happens with good test equipment, I persuaded the U. to replace the NIC
card and all was again sweetness and light.
There are other, more mundane, natural acts of retransmits. It's fun to
watch outside/inside IP traffic once in a while. Besides, it would give you
a 'feel' for what looks 'good' sos't when it's very, very bad, you have some
baseline for a troubleshooting start.
And a baseline that 30% is too much on a sustained basis.
Very best, G.
-----Original Message-----
From: Nick R [mailto:[EMAIL PROTECTED]]
Sent: Monday, June 11, 2001 11:35 AM
To: [EMAIL PROTECTED]
Subject: RE: retransmissions [7:7731]
Forget about AutoNegotiation and set all nodes to manual 10 or 100 Mbps.
Also, Priscilla had some good questions. What kind of retransmissions are
those? What layer? The Expert Software in the Sniffer will tell you the
details broken down to a plain english language.
-- Nick
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=8180&t=7731
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