----- Original Message -----
Sent: Monday, September 12, 2005 7:55
PM
Subject: [Ethereal-users] TCP
Retransmissions and resets: What is an"acceptable" rate of occur rence?
I am wondering
what is an acceptable rate of occurrence for TCP retransmissions and
resets.
Let's say you open
up capture of 10 minutes of Internet traffic for a small office LAN
with 10 users and one switch/router/firewall, and you see
retransmissions.
==>Alok:
Even more predominant on tunneled setups
You examine a few
of the connections closely for retransmissions and resets, and you don't see
very many per connection, and you don't see the connection closing because of
too many retransmissions. You just occasionally see one frame not get an
acknowledgment quickly enough, and a single retransmission is sent because of
a time out. Or occasionally, a connection is just closed with a reset,
and you don't know if the user simply closed their browser in the middle of
loading a page.
==>Alok: see if
there is another session after the RST with the same peer?
If you total the
number of TCP frames per connection, and figure the retransmissions/resets
rate per frame, you could get <1%, or 5%, or 10%.
==> Alok: is it
per frame? or per connection? do you mean 10% of your traffic is
retransmissions? good! what is it ? a wireless/VSAT link?
One recent
capture had 300 total retransmissions for one user, but the number of frames
for this user was 21.531, for a rate of 1.39%. Do I ignore this as a
normal occurrence?.
=> Alok: What
do you meanby "rate" here?
I expect some
retransmissions/resets to be a "normal" event, but at what rate do you begin to
be concerned?
Isn't some low
rate such as 2% actually "normal" for an Internet
connection?
Do you know a
source for what is generally accepted to be a "normal" for TCP
traffic?
And what if the
traffic is for a small LAN, rather than for an Internet connection? What
rate is acceptable for a LAN?
Doug
(Gunndo)
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