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=-3.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 20B79C432BE for ; Fri, 27 Aug 2021 21:46:23 +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 C1A7A60FD8 for ; Fri, 27 Aug 2021 21:46:21 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org C1A7A60FD8 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=romanrm.net Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.zx2c4.com Received: by lists.zx2c4.com (ZX2C4 Mail Server) with ESMTP id 532adcf7; Fri, 27 Aug 2021 21:44:59 +0000 (UTC) Received: from rin.romanrm.net (rin.romanrm.net [2001:bc8:2dd2:1000::1]) by lists.zx2c4.com (ZX2C4 Mail Server) with ESMTPS id acefedb0 (TLSv1.3:AEAD-AES256-GCM-SHA384:256:NO) for ; Fri, 27 Aug 2021 21:44:55 +0000 (UTC) Received: from natsu (natsu2.home.romanrm.net [IPv6:fd39::e99e:8f1b:cfc9:ccb8]) by rin.romanrm.net (Postfix) with SMTP id F343C69F; Fri, 27 Aug 2021 21:44:54 +0000 (UTC) Date: Sat, 28 Aug 2021 02:44:54 +0500 From: Roman Mamedov To: Mike O'Connor Cc: Daniel , wireguard@lists.zx2c4.com Subject: Re: [Warning: DMARC Fail Email] Re: ipv6 connexion fail - ipv4 OK Message-ID: <20210828024454.1766744f@natsu> In-Reply-To: <34d4341c-98be-b754-af8e-c7097bc21aac@pineview.net> References: <20210827211412.3ed5f170@natsu> <3ec547c6-c846-e5be-e276-ace7862f5cb7@tootai.net> <34d4341c-98be-b754-af8e-c7097bc21aac@pineview.net> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit 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" On Sat, 28 Aug 2021 07:05:45 +0930 Mike O'Connor wrote: > On a 1500 link I'm having to use 1280 to get ipv6 to successfully go > over a wireguard link. Then it is not a true 1500 MTU link, something in-between drops packets at a lower bar. Or maybe not all of them, but just UDP, for example. But yeah, 1280 is worth trying as well, maybe Daniel has a similar issue. As for me I am using MTU 1412 WG over IPv6 on a 1492 MTU underlying link just fine. > I really think wireguard should be able to fragment and send via > multiply UDP packets. It is able to, as long as the underlying link MTU is set to a correct value (i.e. where largest-sized packets actually go through, and not get silently dropped). -- With respect, Roman