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[84.248.124.13]) by smtp.googlemail.com with ESMTPSA id x19sm1718228ljb.6.2019.06.24.04.48.11 for (version=TLS1_3 cipher=AEAD-AES128-GCM-SHA256 bits=128/128); Mon, 24 Jun 2019 04:48:11 -0700 (PDT) To: freebsd-net@freebsd.org From: "Jukka A. Ukkonen" Subject: Odd TCP ECN related bahavior Message-ID: <777f12f5-3c58-a6ef-5a92-df6be9372ec6@gmail.com> Date: Mon, 24 Jun 2019 14:48:10 +0300 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-GB Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: C4C0C6B3C8 X-Spamd-Bar: ------ Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=hCshanax; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (mx1.freebsd.org: domain of jau789@gmail.com designates 2a00:1450:4864:20::234 as permitted sender) smtp.mailfrom=jau789@gmail.com X-Spamd-Result: default: False [-6.83 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; R_SPF_ALLOW(-0.20)[+ip6:2a00:1450:4000::/36]; FREEMAIL_FROM(0.00)[gmail.com]; TO_DN_NONE(0.00)[]; RCVD_COUNT_THREE(0.00)[3]; DKIM_TRACE(0.00)[gmail.com:+]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; MX_GOOD(-0.01)[cached: alt3.gmail-smtp-in.l.google.com]; NEURAL_HAM_SHORT(-0.95)[-0.954,0]; FROM_EQ_ENVFROM(0.00)[]; RCVD_TLS_LAST(0.00)[]; MIME_TRACE(0.00)[0:+]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US]; MID_RHS_MATCH_FROM(0.00)[]; DWL_DNSWL_NONE(0.00)[gmail.com.dwl.dnswl.org : 127.0.5.0]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20161025]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-net@freebsd.org]; RCPT_COUNT_ONE(0.00)[1]; IP_SCORE(-2.87)[ip: (-9.42), ipnet: 2a00:1450::/32(-2.54), asn: 15169(-2.32), country: US(-0.06)]; RCVD_IN_DNSWL_NONE(0.00)[4.3.2.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.5.4.1.0.0.a.2.list.dnswl.org : 127.0.5.0] X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 24 Jun 2019 11:48:17 -0000 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