From owner-freebsd-current@freebsd.org Mon Mar 8 19:18:26 2021 Return-Path: Delivered-To: freebsd-current@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 43FE0553DDA for ; Mon, 8 Mar 2021 19:18:26 +0000 (UTC) (envelope-from lars@gustik.eu) Received: from troy.gustik.eu (troy.gustik.eu [165.227.162.104]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4DvSmc3zlbz3LH7 for ; Mon, 8 Mar 2021 19:18:22 +0000 (UTC) (envelope-from lars@gustik.eu) Received: from troy.gustik.eu (localhost [IPv6:::1]) by troy.gustik.eu (Postfix) with ESMTP id BF9F12ADCD8 for ; Mon, 8 Mar 2021 20:18:14 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=gustik.eu; s=troy; t=1615231094; bh=J/BWtl7fmokEnP8Kfvepm1LQBPj/R0GfXtP5/YhHxAk=; h=Subject:From:To:Date; b=jLHqiuOjgXGBRLdFoaiarvhDPH2lTKKAgWKD7Bko9RCb9RYmj9gvLbUzaSf8ak0dS tVEkSSS/1oYnXpXdAF30z/b77NIG0jSJUoggLQWBcxDq75tG18EmIbTcXaZWv3aCFP WzhoDtTcvPjIrJRFVR+mq7S0LsMTzX5MDKW6HzGw= Received: from romy.j20.helspy.pw ([178.143.43.174]) by troy.gustik.eu with ESMTPSA id WV0GLHZ4RmBiBgAADR3MKA (envelope-from ) for ; Mon, 08 Mar 2021 20:18:14 +0100 Message-ID: <2a8d7089955ca70cd4e0e644aef988ca4a9019e3.camel@gustik.eu> Subject: FreeBSD 13.0-RC1 ethertype IPv6 (0x86dd), length 2942 on 1500 MTU From: Lars Schotte To: freebsd-current@freebsd.org Date: Mon, 08 Mar 2021 20:18:19 +0100 Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.28.5 (3.28.5-16.el8) Mime-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 4DvSmc3zlbz3LH7 X-Spamd-Bar: --- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gustik.eu header.s=troy header.b=jLHqiuOj; dmarc=none; spf=pass (mx1.freebsd.org: domain of lars@gustik.eu designates 165.227.162.104 as permitted sender) smtp.mailfrom=lars@gustik.eu X-Spamd-Result: default: False [-3.00 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; MV_CASE(0.50)[]; R_SPF_ALLOW(-0.20)[+mx]; TO_DN_NONE(0.00)[]; RCVD_COUNT_THREE(0.00)[3]; DKIM_TRACE(0.00)[gustik.eu:+]; NEURAL_HAM_SHORT(-1.00)[-1.000]; FROM_EQ_ENVFROM(0.00)[]; RCVD_TLS_LAST(0.00)[]; RBL_DBL_DONT_QUERY_IPS(0.00)[165.227.162.104:from]; ASN(0.00)[asn:14061, ipnet:165.227.160.0/20, country:US]; MIME_TRACE(0.00)[0:+]; MID_RHS_MATCH_FROM(0.00)[]; RECEIVED_SPAMHAUS_PBL(0.00)[178.143.43.174:received]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[gustik.eu:s=troy]; FREEFALL_USER(0.00)[lars]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-current@freebsd.org]; DMARC_NA(0.00)[gustik.eu]; RCPT_COUNT_ONE(0.00)[1]; SPAMHAUS_ZRD(0.00)[165.227.162.104:from:127.0.2.255]; MAILMAN_DEST(0.00)[freebsd-current] X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 08 Mar 2021 19:18:26 -0000 Hey friends, I am running this FreeBSD 13.0-RC1 and I am experiencing strange Ethernet frame sizes, TCP sizes well above 2500 on an MTU of 1500. Somehow it seems that this problem only applies on IPv6, IPv4 works fine. I have seen some strange network behaviour with TCP connections randomly dropping under load, and now I see that they are too big. MSS-MAX on PF also does not help. It seems to ignore my 1440 setting. Something is broken here and I do not know what. Is anyone else experiencing this on IPv6? -- Lars Schotte Mudroňova 13 92101 Piešťany