From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9E84DC433DB for ; Thu, 21 Jan 2021 13:40:50 +0000 (UTC) Received: from lists.zx2c4.com (lists.zx2c4.com [165.227.139.114]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 517A723877 for ; Thu, 21 Jan 2021 13:40:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 517A723877 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=afaics.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=wireguard-bounces@lists.zx2c4.com Received: by lists.zx2c4.com (ZX2C4 Mail Server) with ESMTP id feca6523; Thu, 21 Jan 2021 13:40:48 +0000 (UTC) Received: from outgoing.selfhost.de (outgoing.selfhost.de [82.98.87.70]) by lists.zx2c4.com (ZX2C4 Mail Server) with ESMTPS id 58a74130 (TLSv1.2:ECDHE-ECDSA-AES256-GCM-SHA384:256:NO) for ; Sun, 17 Jan 2021 10:36:47 +0000 (UTC) Received: (qmail 13431 invoked from network); 17 Jan 2021 10:36:47 -0000 Received: from unknown (HELO mailhost.afaics.de) (postmaster@xqrsonfo.mail.selfhost.de@87.160.250.197) by mailout.selfhost.de with ESMTPA; 17 Jan 2021 10:36:47 -0000 Received: from cecil.afaics.de (cecil.afaics.de [10.42.100.186]) by mailhost.afaics.de (OpenSMTPD) with ESMTP id 2878b8f6; Sun, 17 Jan 2021 10:36:42 +0000 (UTC) To: wireguard@lists.zx2c4.com From: Harald Dunkel Subject: mtu on Linux vs MacOS Message-ID: Date: Sun, 17 Jan 2021 11:36:42 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.6.1 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Mailman-Approved-At: Thu, 21 Jan 2021 00:19:16 +0000 X-BeenThere: wireguard@lists.zx2c4.com X-Mailman-Version: 2.1.30rc1 Precedence: list List-Id: Development discussion of WireGuard List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: wireguard-bounces@lists.zx2c4.com Sender: "WireGuard" Hi folks, I am using PPPoE to connect to my IP provider. To use wireguard on Linux I have to reduce the MTU in wg0.conf to 1400. Using the default 1420 a ssh connection tunneled through wireguard gets stuck (reproducible). An echo of a very long line (e.g. 4096 chars) is sufficient. The weird part is, MTU 1420 works fine for wireguard on MacOS. How comes that Wireguard appears to be more stable on MacOS than on Linux? Peer is OpenBSD 6.8. Regards Harri