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=-0.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, FREEMAIL_REPLYTO_END_DIGIT,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 816D2C432BE for ; Mon, 2 Aug 2021 13:18:53 +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 CAAC760F70 for ; Mon, 2 Aug 2021 13:18:52 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org CAAC760F70 Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=protonmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.zx2c4.com Received: by lists.zx2c4.com (ZX2C4 Mail Server) with ESMTP id 04e20856; Mon, 2 Aug 2021 13:14:12 +0000 (UTC) Received: from mail-4318.protonmail.ch (mail-4318.protonmail.ch [185.70.43.18]) by lists.zx2c4.com (ZX2C4 Mail Server) with ESMTPS id 067c0450 (TLSv1.3:AEAD-AES256-GCM-SHA384:256:NO) for ; Fri, 2 Jul 2021 04:18:53 +0000 (UTC) Date: Fri, 02 Jul 2021 04:18:51 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=protonmail.com; s=protonmail; t=1625199532; bh=XZfpOctUgH91ggf6JpaL/e5zilxhgdlK/2dxxtAKmyU=; h=Date:To:From:Reply-To:Subject:From; b=e0UklAic7UBYxjphkWR80YI5MpBG4RbqItHBf/dcITfEvLj7miWD8MkDnfTR/n8/D rfQtvQjpgWUKD+Hn9xd0tW94bytb8HDQl9Jf8dSRA06eBbMv4wRW8wbIC5c8HdeMie rrDJl648BKpSsgmjt2lCpvdKjouUR0xknhY5qrIU= To: "wireguard@lists.zx2c4.com" From: j19981106 Subject: The default value of the IPv6 MTU of the Windows client is incorrect. Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Mailman-Approved-At: Mon, 02 Aug 2021 13:14:07 +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: , Reply-To: j19981106 Errors-To: wireguard-bounces@lists.zx2c4.com Sender: "WireGuard" I found that when the Windows client does not set the MTU value, the IPv6 M= TU will be 65535. This will cause IPv6 to not work properly. Use the `netsh interface ipv6 show subinterfaces` command to view the IPv6 = MTU value. When I checked the mailing list, I saw a question about the MTU value of Ap= ple products, but I only saw a vague answer. Do Apple products still have t= his problem? Is it reasonable that the default MTU is 1420? Mailing list regarding the MTU value of Apple products: https://lists.zx2c4.com/pipermail/wireguard/2017-December/002201.html