Date: Sat, 22 Jul 2000 16:59:29 +0300 From: Nimrod Mesika <nimrodm@bezeqint.net> To: freebsd-net@FreeBSD.org Subject: rfc1323 timestamps Message-ID: <20000722165929.A1060@localhost.bsd.net.il>
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The following behavior has been observed while talking to a
Linux machine (timestamps enabled, tcpdump output modified
for easier reading):
21.66 bsd > linux: ack 1 win 17376
<timestamp 870965 310862190>
^ ts1 sent by bsd
22.05 linux > bsd: 1:1449(1448) ack 1 win 32120
<timestamp 310862207 870965>
^ts1 echoed by linux
22.14 bsd > linux: ack 1449 win 17376
<timestamp 871013 310862207>
^ ts2 sent by bsd
22.23 linux > bsd: 1449:2897(1448) ack 1 win 32120
<timestamp 310862207 870965>
^ ts1 echoed by linux AGAIN
...
For each ack+timestamp sent by FreeBSD, Linux sends two data packets
(i.e., slow start) - both echoing back the same timestamp.
1. Is this standard behavior?
2. Will FreeBSD behave in the same way? (couldn't test as most BSD
machines have rfc1323 timestamps turned off).
-- Nimrod.
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