Date: Mon, 24 Jun 2019 14:48:10 +0300 From: "Jukka A. Ukkonen" <jau789@gmail.com> To: freebsd-net@freebsd.org Subject: Odd TCP ECN related bahavior Message-ID: <777f12f5-3c58-a6ef-5a92-df6be9372ec6@gmail.com>
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Hi all, I am not on this mailing list. So, all responses should be sent to my personal address. I just noticed somewhat confusing network behavior when I was using wireshark to understand why certain connections have been unexpectedly slow. My 11.3 stable (latest update 2019-06-23) seems to do this according to wireshark... .... ..00 = Explicit Congestion Notification: Not ECN-Capable Transport (0) My system has this set, though... net.inet.tcp.ecn.enable: 1 At the same time the peer system was reporting ECN capability... .... ..10 = Explicit Congestion Notification: ECN-Capable Transport codepoint '10' (2) Apparently increasing the value in... net.inet.tcp.ecn.maxretries doesn't help. What should I make of this? Is the ECN implementation in 11.3 somehow faulty or is this something more down to earth? --jau
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