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Posting-Version: version B 2.10.3 alpha 4/15/85; site ucbvax.ARPA
Path: utzoo!watmath!clyde!burl!ulysses!ucbvax!tcp-ip
From: tcp-ip@ucbvax.ARPA
Newsgroups: fa.tcp-ip
Subject: Retransmission timeouts
Message-ID: <8548@ucbvax.ARPA>
Date: Thu, 27-Jun-85 12:08:13 EDT
Article-I.D.: ucbvax.8548
Posted: Thu Jun 27 12:08:13 1985
Date-Received: Fri, 28-Jun-85 02:12:33 EDT
Sender: daemon@ucbvax.ARPA
Organization: University of California at Berkeley
Lines: 28

From: Murray.pa@Xerox.ARPA

A few days ago, Andrew McDowell @ucl-cs sent a msg to namedroppers
reporting round trip times to the states of "about 2.5-3 seconds". That
seemed too good to be true, but when I tried popking his server, that's
what I observed.

Well, a while ago, I was testing a new ICMP Echo tool, and looking for
strange cases, I fished around in my old mail file for Andrew's message
and tried one of his hosts: 128.16.5.2.

I've seen round trip times as long at 34 seconds! I'm using 20 byte
packets. In the last hour or so, I've rarely seen anything as low as 3
seconds.

From a recent run:
	5 out of 35 packets were lost. (That's 14%.)
	23% of the packets took between 7 and 10 seconds.
	20% of the packets took between 10 and 14 seconds.
	40% of the packets took between 20 and 28 seconds.
	The min time was 3.2 seconds.
	The max time was 28 seconds.

Things just started working again. A test that just finished had a
strong peak between 2 and 2.8 seconds.

Oops. I guess I spoke too soon. It's back to the slow mode now. 4 out of
14 took over 28 seconds.