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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D7942C433EF for ; Mon, 4 Oct 2021 05:33:28 +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 86AFC61216 for ; Mon, 4 Oct 2021 05:33:27 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 86AFC61216 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=emdete.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.zx2c4.com Received: by lists.zx2c4.com (ZX2C4 Mail Server) with ESMTP id 1051e377; Mon, 4 Oct 2021 05:30:50 +0000 (UTC) Received: from emdete.de (emdete.de [2a01:4f8:140:81c4::2]) by lists.zx2c4.com (ZX2C4 Mail Server) with ESMTPS id 4dff5ae0 (TLSv1.3:AEAD-AES256-GCM-SHA384:256:NO) for ; Mon, 4 Oct 2021 05:30:49 +0000 (UTC) Received: from emdete.de ( [185.254.75.44]) by emdete.de (OpenSMTPD) with ESMTPSA id 3afeff30 (TLSv1.3:TLS_AES_256_GCM_SHA384:256:NO); Mon, 4 Oct 2021 05:30:48 +0000 (UTC) Received: from localhost (emdete.de [local]) by emdete.de (OpenSMTPD) with ESMTPA id 208d8b97; Mon, 4 Oct 2021 05:30:44 +0000 (UTC) Date: Mon, 04 Oct 2021 07:30:44 +0200 From: "M. Dietrich" Subject: Re: Behaviour on MTU problem To: Art Botterell , wireguard@lists.zx2c4.com References: <1630347517.szy5mrrs16.astroid@morple.none> <08C6DA98-A534-451D-9007-FF8627C48065@gmail.com> In-Reply-To: <08C6DA98-A534-451D-9007-FF8627C48065@gmail.com> MIME-Version: 1.0 User-Agent: astroid/0.16.0 (https://github.com/astroidmail/astroid) Message-Id: <1633325115.iotxkgm6j2.astroid@morple.none> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable 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" Quotation from Art Botterell at August 30, 2021 21:55: > One reads about fragmentation-induced failures and about=20 > various MTU values that did or didn't work in a particular=20 > situation. [...] what we could look out for in order=20 > automatically to detect MTU issues [...] Is there some sort=20 > of a =E2=80=98fragtest=E2=80=99 network utility out there? My request was neither about anekdotic problems with different=20 MTU sizes nor any automatic detection of a correct size and=20 test utilities. i was asking why the kernel module is completly locking up if=20 a MTU size problem is present. best regards, Michael