From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751683AbcCFPRY (ORCPT ); Sun, 6 Mar 2016 10:17:24 -0500 Received: from dd27218.kasserver.com ([85.13.142.250]:57210 "EHLO dd27218.kasserver.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751427AbcCFPRP (ORCPT ); Sun, 6 Mar 2016 10:17:15 -0500 X-Greylist: delayed 425 seconds by postgrey-1.27 at vger.kernel.org; Sun, 06 Mar 2016 10:17:14 EST From: Andreas Messer To: linux-kernel@vger.kernel.org Subject: Unexpected tcpv6 connection resets since linux 4.4 Date: Sun, 06 Mar 2016 16:10:07 +0100 Message-ID: <4875526.tAzumr2zO3@proton> User-Agent: KMail/4.14.1 (Linux/4.3.3-proton; KDE/4.14.2; x86_64; ; ) MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="nextPart22421336.bPMet2aReV" Content-Transfer-Encoding: 7Bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is a multi-part message in MIME format. --nextPart22421336.bPMet2aReV Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Hi there, i have updated two of my machines in the last weeks to linux 4.4.1 and linux 4.4.3. It seems that since then i get unexpected TCPv6 connection resets when connecting to these machines remotely. The issue occurs with sshd and with a http service. /etc/hosts.deny and /etc/hosts.allow are empty on both server machines. I'm not so in IPv6 and have no idea whats going on. Please find attached a network trace from one of the machines when connecting with ssh (on port 23 for debugging). Redirects should be accepted according to settings: root@banana:/proc/sys/net/ipv6# cat conf/wlan0/forwarding 0 root@banana:/proc/sys/net/ipv6# cat conf/wlan0/accept_redirects 1 root@banana:/proc/sys/net/ipv6# uname -a Linux banana 4.4.1-banana #3 SMP Wed Feb 17 23:03:38 CET 2016 x86_64 GNU/Linux Is there some new network settings or features? My network consists of an ethernet/wlan router where subnet of wlan and ethernet are identical. (forced by the router, but was never a problem before). The problem occurs when connecting from ethernet machine to wlan machine and when connecting from wlan machine to wlan machine. At the moment its not possible to establish a connection with these machines using IPv6. Thanks for help! Cheers Andreas --nextPart22421336.bPMet2aReV Content-Disposition: attachment; filename="ipv6_rst_after_redirect.pcapng" Content-Transfer-Encoding: base64 Content-Type: application/x-pcapng; name="ipv6_rst_after_redirect.pcapng" Cg0NCmwAAABNPCsaAQAAAP//////////AwASAExpbnV4IDQuNC4xLWJhbmFuYQAABAAtAER1bXBj YXAgMS4xMi4xIChHaXQgUmV2IFVua25vd24gZnJvbSB1bmtub3duKQAAAAAAAABsAAAAAQAAAEQA AAABAAAAAAAEAAIABQB3bGFuMAAAAAkAAQAGAAAADAASAExpbnV4IDQuNC4xLWJhbmFuYQAAAAAA AEQAAAAGAAAAgAAAAAAAAABiLQUA8uGcOV4AAABeAAAATDSIPtWMnMem7iB3ht1gAX3AACgGP/0f bRAkoAABnXsXkIn/NRr9H20QJKAAAcDxCY6iDxtKhdoAF8qEvRAAAAAAoAJv4JgiAAACBAWYBAII CgAFGOwAAAAAAQMDBwAAgAAAAAYAAACAAAAAAAAAAGItBQAs4pw5XgAAAF4AAACcx6buIHdMNIg+ 1YyG3WAGg3UAKAZA/R9tECSgAAHA8QmOog8bSv0fbRAkoAABnXsXkIn/NRoAF4XarpCFyMqEvRGg Em7w6GAAAAIEBZgEAggKAA58OQAFGOwBAwMHAACAAAAABgAAAOAAAAAAAAAAYi0FAO/onDm+AAAA vgAAAEw0iD7VjJzHpu4gd4bdYAAAAACIOv/+gAAAAAAAAJ7Hpv/+7iB3/R9tECSgAAHA8QmOog8b SokAAEkAAAAA/R9tECSgAAGdexeQif81Gv0fbRAkoAABnXsXkIn/NRoCAQAlkF11aAQLAAAAAAAA YAaDdQAoBkD9H20QJKAAAcDxCY6iDxtK/R9tECSgAAGdexeQif81GgAXhdqukIXIyoS9EaASbvDo YAAAAgQFmAQCCAoADnw5AAUY7AEDAwcAAOAAAAAGAAAAeAAAAAAAAABiLQUAj+ucOVYAAABWAAAA TDSIPtWMACWQXXVoht1gAX3AACAGQP0fbRAkoAABnXsXkIn/NRr9H20QJKAAAcDxCY6iDxtKhdoA F8qEvRGukIXJgBAA4IUHAAABAQgKAAUZBgAOfDkAAHgAAAAGAAAAbAAAAAAAAABiLQUAvOucOUoA AABKAAAAnMem7iB3TDSIPtWMht1gACJcABQGQP0fbRAkoAABwPEJjqIPG0r9H20QJKAAAZ17F5CJ /zUaABeF2q6QhckAAAAAUAQAANvzAAAAAGwAAAAGAAAAoAAAAAAAAABiLQUAe+ycOX0AAAB9AAAA TDSIPtWMACWQXXVoht1gAX3AAEcGQP0fbRAkoAABnXsXkIn/NRr9H20QJKAAAcDxCY6iDxtKhdoA F8qEvRGukIXJgBgA4F3xAAABAQgKAAUZBgAOfDlTU0gtMi4wLU9wZW5TU0hfNi43cDEgRGViaWFu LTUrZGViOHUxDQoAAACgAAAABgAAAGwAAAAAAAAAYi0FAJ7snDlKAAAASgAAAJzHpu4gd0w0iD7V jIbdYAAiXAAUBkD9H20QJKAAAcDxCY6iDxtK/R9tECSgAAGdexeQif81GgAXhdqukIXJAAAAAFAE AADb8wAAAABsAAAABgAAAMgAAAAAAAAAYi0FAFH0nDmmAAAApgAAAEw0iD7VjJzHpu4gd4bdYAAA AABwOv/+gAAAAAAAAJ7Hpv/+7iB3/R9tECSgAAHA8QmOog8bSokAPXcAAAAA/R9tECSgAAGdexeQ if81Gv0fbRAkoAABnXsXkIn/NRoCAQAlkF11aAQIAAAAAAAAYAAiXAAUBkD9H20QJKAAAcDxCY6i DxtK/R9tECSgAAGdexeQif81GgAXhdqukIXJAAAAAFAEAAAAAMgAAAAGAAAAyAAAAAAAAABiLQUA e/ScOaYAAACmAAAATDSIPtWMnMem7iB3ht1gAAAAAHA6//6AAAAAAAAAnsem//7uIHf9H20QJKAA AcDxCY6iDxtKiQA9dwAAAAD9H20QJKAAAZ17F5CJ/zUa/R9tECSgAAGdexeQif81GgIBACWQXXVo BAgAAAAAAABgACJcABQGQP0fbRAkoAABwPEJjqIPG0r9H20QJKAAAZ17F5CJ/zUaABeF2q6QhckA AAAAUAQAAAAAyAAAAAUAAABsAAAAAAAAAGItBQC6bBs6AQAcAENvdW50ZXJzIHByb3ZpZGVkIGJ5 IGR1bXBjYXACAAgAYi0FAGttWTkDAAgAYi0FAANsGzoEAAgAQQAAAAAAAAAFAAgAAAAAAAAAAAAA AAAAbAAAAA== --nextPart22421336.bPMet2aReV--