From owner-freebsd-net@freebsd.org Mon Dec 23 09:41:26 2019 Return-Path: Delivered-To: freebsd-net@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 646301EB015 for ; Mon, 23 Dec 2019 09:41:26 +0000 (UTC) (envelope-from bu7cher@yandex.ru) Received: from forward101p.mail.yandex.net (forward101p.mail.yandex.net [IPv6:2a02:6b8:0:1472:2741:0:8b7:101]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 47hDrP3fz5z4RJf for ; Mon, 23 Dec 2019 09:41:25 +0000 (UTC) (envelope-from bu7cher@yandex.ru) Received: from mxback21j.mail.yandex.net (mxback21j.mail.yandex.net [IPv6:2a02:6b8:0:1619::221]) by forward101p.mail.yandex.net (Yandex) with ESMTP id D35FD3281455; Mon, 23 Dec 2019 12:41:21 +0300 (MSK) Received: from sas2-b157fac3b6f2.qloud-c.yandex.net (sas2-b157fac3b6f2.qloud-c.yandex.net [2a02:6b8:c08:b282:0:640:b157:fac3]) by mxback21j.mail.yandex.net (mxback/Yandex) with ESMTP id E7BaAgFmsP-fL48xmTo; Mon, 23 Dec 2019 12:41:21 +0300 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex.ru; s=mail; t=1577094081; bh=AVZbgIBIwimAfNgllVzOOQ6NSlaW2iLCvvM64D5XQT8=; h=In-Reply-To:From:Date:References:To:Subject:Message-ID; b=ZYzCOE9iXtBa2ytM0Ef4x4DhUFRgUmyfBhqX7FyyCz1HpxdMxDpxMEyiAggI+fnmK kK6TTQCuCLtzfZqMfzGsn3raXk5D64wWZAzhSn6eMDU6Zdi2LDDqnliFd0XSzCpXjO YIHxwUhcprtv2Gb4xwQLOE6UV1U6jlHxFFlI1voc= Received: by sas2-b157fac3b6f2.qloud-c.yandex.net (smtp/Yandex) with ESMTPSA id zWT6KIfgVu-fL0KPuac; Mon, 23 Dec 2019 12:41:21 +0300 (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (Client certificate not present) Subject: Re: IPSec transport mode, mtu, fragmentation... To: Victor Sudakov , freebsd-net@freebsd.org References: <20191220152314.GA55278@admin.sibptus.ru> <20191220160357.GB56081@admin.sibptus.ru> <20191220162233.GA56815@admin.sibptus.ru> From: "Andrey V. Elsukov" Openpgp: id=E6591E1B41DA1516F0C9BC0001C5EA0410C8A17A Autocrypt: addr=bu7cher@yandex.ru; prefer-encrypt=mutual; keydata= mQENBEwBF1kBCADB9sXFhBEUy8qQ4X63Y8eBatYMHGEFWN9ypS5lI3RE6qQW2EYbxNk7qUC5 21YIIS1mMFVBEfvR7J9uc7yaYgFCEb6Sce1RSO4ULN2mRKGHP3/Sl0ijZEjWHV91hY1YTHEF ZW/0GYinDf56sYpDDehaBF5wkWIo1+QK5nmj3vl0DIDCMNd7QEiWpyLVwECgLX2eOAXByT8B bCqVhJGcG6iFP7/B9Ll6uX5gb8thM9LM+ibwErDBVDGiOgvfxqidab7fdkh893IBCXa82H9N CNwnEtcgzh+BSKK5BgvPohFMgRwjti37TSxwLu63QejRGbZWSz3OK3jMOoF63tCgn7FvABEB AAG0JUFuZHJleSBWLiBFbHN1a292IDxidTdjaGVyQHlhbmRleC5ydT6JATgEEwECACIFAkwB F1kCGwMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJEAHF6gQQyKF6qmYIAI6ekfm1VA4T vqankI1ISE6ku4jV7UlpIQlEbE7/8n3Zd6teJ+pGOQhN5qk8QE7utdPdbktAzi+x7LIJVzUw 4TywZLXGrkP7VKYkfg6oyCGyzITghefQeJtr2TN4hYCkzPWpylkue8MtmqfZv/6royqwTbN+ +E09FQNvTgRUYJYTeQ1qOsxNRycwvw3dr2rOfuxShbzaHBB1pBIjGrMg8fC5pd65ACH5zuFV A0CoTNGMDrEZSfBkTW604UUHFFXeCoC3dwDZRKOWJ3GmMXns65Ai5YkA63BSHEE1Qle3VBhd cG1w0CB5FBV3pB27UVnf0jEbysrDqW4qN7XMRFSWNAy5AQ0ETAEXWQEIAJ2p6l9LBoqdH/0J PEFDY2t2gTvAuzz+8zs3R03dFuHcNbOwjvWCG0aOmVpAzkRa8egn5JB4sZaFUtKPYJEQ1Iu+ LUBwgvtXf4vWpzC67zs2dDuiW4LamH5p6xkTD61aHR7mCB3bg2TUjrDWn2Jt44cvoYxj3dz4 S49U1rc9ZPgD5axCNv45j72tggWlZvpefThP7xT1OlNTUqye2gAwQravXpZkl5JG4eOqJVIU X316iE3qso0iXRUtO7OseBf0PiVmk+wCahdreHOeOxK5jMhYkPKVn7z1sZiB7W2H2TojbmcK HZC22sz7Z/H36Lhg1+/RCnGzdEcjGc8oFHXHCxUAEQEAAYkBHwQYAQIACQUCTAEXWQIbDAAK CRABxeoEEMihegkYCAC3ivGYNe2taNm/4Nx5GPdzuaAJGKWksV+w9mo7dQvU+NmI2az5w8vw 98OmX7G0OV9snxMW+6cyNqBrVFTu33VVNzz9pnqNCHxGvj5dL5ltP160JV2zw2bUwJBYsgYQ WfyJJIM7l3gv5ZS3DGqaGIm9gOK1ANxfrR5PgPzvI9VxDhlr2juEVMZYAqPLEJe+SSxbwLoz BcFCNdDAyXcaAzXsx/E02YWm1hIWNRxanAe7Vlg7OL+gvLpdtrYCMg28PNqKNyrQ87LQ49O9 50IIZDOtNFeR0FGucjcLPdS9PiEqCoH7/waJxWp6ydJ+g4OYRBYNM0EmMgy1N85JJrV1mi5i Message-ID: <55eeca4c-9633-339a-f521-b0db462cc1d6@yandex.ru> Date: Mon, 23 Dec 2019 12:39:49 +0300 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20191220162233.GA56815@admin.sibptus.ru> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="ITUETDXWxeuTRpi5N7M4pI9RZI0vgaBPc" X-Rspamd-Queue-Id: 47hDrP3fz5z4RJf X-Spamd-Bar: ------ Authentication-Results: mx1.freebsd.org; dkim=pass header.d=yandex.ru header.s=mail header.b=ZYzCOE9i; dmarc=pass (policy=none) header.from=yandex.ru; spf=pass (mx1.freebsd.org: domain of bu7cher@yandex.ru designates 2a02:6b8:0:1472:2741:0:8b7:101 as permitted sender) smtp.mailfrom=bu7cher@yandex.ru X-Spamd-Result: default: False [-6.20 / 15.00]; TO_DN_SOME(0.00)[]; FREEMAIL_FROM(0.00)[yandex.ru]; R_SPF_ALLOW(-0.20)[+ip6:2a02:6b8:0:1000::/52:c]; HAS_ATTACHMENT(0.00)[]; RCVD_COUNT_THREE(0.00)[3]; DKIM_TRACE(0.00)[yandex.ru:+]; RCPT_COUNT_TWO(0.00)[2]; DMARC_POLICY_ALLOW(-0.50)[yandex.ru,none]; SIGNED_PGP(-2.00)[]; FROM_EQ_ENVFROM(0.00)[]; IP_SCORE(0.00)[ip: (-9.41), ipnet: 2a02:6b8::/32(-4.71), asn: 13238(-3.79), country: RU(0.01)]; MIME_TRACE(0.00)[0:+,1:+,2:+,3:~]; FREEMAIL_ENVFROM(0.00)[yandex.ru]; ASN(0.00)[asn:13238, ipnet:2a02:6b8::/32, country:RU]; MID_RHS_MATCH_FROM(0.00)[]; RCVD_IN_DNSWL_LOW(-0.10)[1.0.1.0.7.b.8.0.0.0.0.0.1.4.7.2.2.7.4.1.0.0.0.0.8.b.6.0.2.0.a.2.list.dnswl.org : 127.0.5.1]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; R_DKIM_ALLOW(-0.20)[yandex.ru:s=mail]; FROM_HAS_DN(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.20)[multipart/signed,multipart/mixed,text/plain]; RCVD_TLS_LAST(0.00)[]; IP_SCORE_FREEMAIL(0.00)[]; DWL_DNSWL_LOW(-1.00)[yandex.ru.dwl.dnswl.org : 127.0.5.1]; TO_MATCH_ENVRCPT_SOME(0.00)[] 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, 23 Dec 2019 09:41:26 -0000 This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --ITUETDXWxeuTRpi5N7M4pI9RZI0vgaBPc Content-Type: multipart/mixed; boundary="KKEA1ap2Sg9vg36OBH6ZLzw0AfAni5C4u"; protected-headers="v1" From: "Andrey V. Elsukov" To: Victor Sudakov , freebsd-net@freebsd.org Message-ID: <55eeca4c-9633-339a-f521-b0db462cc1d6@yandex.ru> Subject: Re: IPSec transport mode, mtu, fragmentation... References: <20191220152314.GA55278@admin.sibptus.ru> <20191220160357.GB56081@admin.sibptus.ru> <20191220162233.GA56815@admin.sibptus.ru> In-Reply-To: <20191220162233.GA56815@admin.sibptus.ru> --KKEA1ap2Sg9vg36OBH6ZLzw0AfAni5C4u Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 20.12.2019 19:22, Victor Sudakov wrote: >> What's the root of the problem? ESP packets cannot get fragmented or >> what?=20 >=20 > Wireshark has shown that the "Don't Fragment" flag is set on all ESP > (protocol 50) packets. Who does this, why, and how can I switch it off > globally? Hi, I think this DF flag is originally from TCP packet. ESP xform for transport mode just replaces protocol in IP header and adds some info to the end of a packet. --=20 WBR, Andrey V. 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