From owner-freebsd-net@freebsd.org Fri Apr 19 12:55:15 2019 Return-Path: Delivered-To: freebsd-net@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 2DA1B156B273 for ; Fri, 19 Apr 2019 12:55:15 +0000 (UTC) (envelope-from bu7cher@yandex.ru) Received: from forward102p.mail.yandex.net (forward102p.mail.yandex.net [IPv6:2a02:6b8:0:1472:2741:0:8b7:102]) (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 6624875C0F for ; Fri, 19 Apr 2019 12:55:13 +0000 (UTC) (envelope-from bu7cher@yandex.ru) Received: from mxback4o.mail.yandex.net (mxback4o.mail.yandex.net [IPv6:2a02:6b8:0:1a2d::1e]) by forward102p.mail.yandex.net (Yandex) with ESMTP id 1D7E31D40A12; Fri, 19 Apr 2019 15:55:02 +0300 (MSK) Received: from smtp1o.mail.yandex.net (smtp1o.mail.yandex.net [2a02:6b8:0:1a2d::25]) by mxback4o.mail.yandex.net (nwsmtp/Yandex) with ESMTP id ZnMCPzuBiK-t1eOYVFd; Fri, 19 Apr 2019 15:55:02 +0300 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex.ru; s=mail; t=1555678502; bh=W5ywAr5wxyp2LBe7uVDgTonxCEtkEROTqcSLrDzSIjY=; h=In-Reply-To:From:Date:References:To:Subject:Message-ID; b=vLa+h1DU4S/EmW132902ZBq2bMrfBV9Y/I4LRhXDWWhvGVS36vYk/Z3LORS3YQtsx C/fZbpYDSzVbVPANfPos19yKboH18LjCHoueGCh2B+5B+aOs6RhXFbDzbLp8IVYJZG K1q3+QFyVFwR37xICIBfq/t2XnEwqqMh1cqBZdw0= Received: by smtp1o.mail.yandex.net (nwsmtp/Yandex) with ESMTPSA id zmIiHPSFI3-t19ORAhJ; Fri, 19 Apr 2019 15:55:01 +0300 (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (Client certificate not present) Subject: Re: unicast vxlan - unable to tcp connect to ipv6 ip's on endpoint host To: Marco van Tol , freebsd-net@freebsd.org References: 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: <0ae5cb32-684c-99ca-cca0-88cce2f8a2fb@yandex.ru> Date: Fri, 19 Apr 2019 15:53:47 +0300 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="OHvlMwft3dXYbcsYwrX6nea97K2kbRCwD" X-Rspamd-Queue-Id: 6624875C0F X-Spamd-Bar: ---------- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=yandex.ru header.s=mail header.b=vLa+h1DU; dmarc=pass (policy=none) header.from=yandex.ru; spf=pass (mx1.freebsd.org: domain of bu7cher@yandex.ru designates 2a02:6b8:0:1472:2741:0:8b7:102 as permitted sender) smtp.mailfrom=bu7cher@yandex.ru X-Spamd-Result: default: False [-10.89 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; TO_DN_SOME(0.00)[]; R_SPF_ALLOW(-0.20)[+ip6:2a02:6b8:0:1000::/52]; FREEMAIL_FROM(0.00)[yandex.ru]; HAS_ATTACHMENT(0.00)[]; RCVD_COUNT_THREE(0.00)[4]; DKIM_TRACE(0.00)[yandex.ru:+]; MX_GOOD(-0.01)[mx.yandex.ru,mx.yandex.ru,mx.yandex.ru,mx.yandex.ru,mx.yandex.ru]; RCPT_COUNT_TWO(0.00)[2]; NEURAL_HAM_SHORT(-1.00)[-0.998,0]; DMARC_POLICY_ALLOW(-0.50)[yandex.ru,none]; SIGNED_PGP(-2.00)[]; FROM_EQ_ENVFROM(0.00)[]; IP_SCORE(-3.68)[ip: (-9.77), ipnet: 2a02:6b8::/32(-4.81), asn: 13238(-3.85), country: RU(0.00)]; RCVD_TLS_LAST(0.00)[]; RCVD_IN_DNSWL_LOW(-0.10)[2.0.1.0.7.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]; ASN(0.00)[asn:13238, ipnet:2a02:6b8::/32, country:RU]; MID_RHS_MATCH_FROM(0.00)[]; ARC_NA(0.00)[]; FREEMAIL_ENVFROM(0.00)[yandex.ru]; R_DKIM_ALLOW(-0.20)[yandex.ru:s=mail]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; FROM_HAS_DN(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.20)[multipart/signed,multipart/mixed,text/plain]; MIME_TRACE(0.00)[0:+,1:+,2:+]; 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: Fri, 19 Apr 2019 12:55:15 -0000 This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --OHvlMwft3dXYbcsYwrX6nea97K2kbRCwD Content-Type: multipart/mixed; boundary="UlUa2IGZRxHJsQOeKfhLV75Em4og2792f"; protected-headers="v1" From: "Andrey V. Elsukov" To: Marco van Tol , freebsd-net@freebsd.org Message-ID: <0ae5cb32-684c-99ca-cca0-88cce2f8a2fb@yandex.ru> Subject: Re: unicast vxlan - unable to tcp connect to ipv6 ip's on endpoint host References: In-Reply-To: --UlUa2IGZRxHJsQOeKfhLV75Em4og2792f Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 19.04.2019 13:46, Marco van Tol wrote: > There is one exception to this: Host B can ping Host A on any of its > IPv6 addresses, but it cannot make any tcp connection to any of the > IPv6 addresses on Host A. Is this expected? Hi, this looks like the problem with checksum offloading. When such offloading is enabled on the interface, such protocols like TCP and UDP defer checksum calculation to interface hardware. ICMPv6 does checksum calculation in software, thus it usually does not affected by such problem. Sometimes NIC hardware or driver have bugs and offloading does not work correctly. You can try to disable checksum offloading on your interfaces and then try. Also you can use tcpdump to try determine what the problem you have with TCP. --=20 WBR, Andrey V. Elsukov --UlUa2IGZRxHJsQOeKfhLV75Em4og2792f-- --OHvlMwft3dXYbcsYwrX6nea97K2kbRCwD Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Comment: Using GnuPG with Thunderbird - https://www.enigmail.net/ iQEzBAEBCAAdFiEE5lkeG0HaFRbwybwAAcXqBBDIoXoFAly5xNsACgkQAcXqBBDI oXowNgf+Lr/3mzM3GrO4NOgGpTZ3If9QPdK7UCJdTQFdE5dXPhB442oI9qxQ2D/Z Bq4cyUvj3BlrCZJ3dw53tAF3cVc3uYjf8mXwUpZ0vUasVc2bw9Uo/2GU3P3CJkiG JNdZgowJ1rxTN3HNetIaggRfIzobh/tPYLJjlPynaRuqL/GOFORHt70kPfUJDqTK Z8Fi4qHpj553v5r3F4L3mrXZsj+iQayX6n9Td0rt2f+S53JATOyilVPQrRBWqSU7 SECTRs1zZnXbD7ZVi9R4jVMJvhBbPnlbhCfYO8dTMuTh8yCHfZfl1QsjPRw6H6/O zwUvxHMDs0AjBc2Gz1Kr934JlJmgNQ== =Oa7m -----END PGP SIGNATURE----- --OHvlMwft3dXYbcsYwrX6nea97K2kbRCwD--