Date: Fri, 19 Apr 2019 15:53:47 +0300 From: "Andrey V. Elsukov" <bu7cher@yandex.ru> To: Marco van Tol <marco@tols.org>, freebsd-net@freebsd.org Subject: Re: unicast vxlan - unable to tcp connect to ipv6 ip's on endpoint host Message-ID: <0ae5cb32-684c-99ca-cca0-88cce2f8a2fb@yandex.ru> In-Reply-To: <B6BC7B2F-7864-427D-ABF0-8E635206F40F@tols.org> References: <B6BC7B2F-7864-427D-ABF0-8E635206F40F@tols.org>
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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" <bu7cher@yandex.ru> To: Marco van Tol <marco@tols.org>, 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: <B6BC7B2F-7864-427D-ABF0-8E635206F40F@tols.org> In-Reply-To: <B6BC7B2F-7864-427D-ABF0-8E635206F40F@tols.org> --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--
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