From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andreas Messer Subject: Re: Unexpected tcpv6 connection resets since linux 4.4 Date: Wed, 09 Mar 2016 20:12:34 +0100 Message-ID: <2277643.Q5Ry2PpJQt@proton> References: <4875526.tAzumr2zO3@proton> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart10649902.Q3VEA1Nnz0"; micalg="pgp-sha1"; protocol="application/pgp-signature" Cc: LKML , Linux Kernel Network Developers To: Cong Wang Return-path: In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org --nextPart10649902.Q3VEA1Nnz0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="UTF-8" On Mon, Mar 7, 2016 at 15:58, Cong Wang wrote: > On Sun, Mar 6, 2016 at 7:10 AM, Andreas Messer wrote: > > 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). > > Sounds like the problem fixed by the following commit: > > commit 9cf7490360bf2c46a16b7525f899e4970c5fc144 > Author: Eric Dumazet > Date: Tue Feb 2 19:31:12 2016 -0800 > > tcp: do not drop syn_recv on all icmp reports Thanks for the tip. I applied the patch to V4,4,1 and it solved the problem. Cheers, Andreas --nextPart10649902.Q3VEA1Nnz0 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part. Content-Transfer-Encoding: 7Bit -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iEYEABECAAYFAlbgdakACgkQkLO6qowrr1F7wQCg2AU21JNW7Ov4JRCBXQZkYVvm OiIAnicH4xCjPCvyjNwnXfJ9jtzSBnKF =oigy -----END PGP SIGNATURE----- --nextPart10649902.Q3VEA1Nnz0--