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To: "wireguard@lists.zx2c4.com" Subject: Help calculate MTU, ISP's 1448 Thread-Topic: Help calculate MTU, ISP's 1448 Thread-Index: AQHUzdBdEG2NAOrQUEeABRiQoQDZLA== Date: Tue, 26 Feb 2019 12:39:50 +0000 Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: SG2PR01CA0142.apcprd01.prod.exchangelabs.com (2603:1096:4:8f::22) To DM6PR12MB3401.namprd12.prod.outlook.com (2603:10b6:5:39::32) x-incomingtopheadermarker: OriginalChecksum:EC1AD79435BAD909DBF5AE3A2CEFCB4723CEEC06DC5E0E17193CD432378483F6; UpperCasedChecksum:F1A8887B2AFAB46FC4AE410DA8A13FF49E562B3F32E53C154DA72AEE84DCDB5F; SizeAsReceived:8125; Count:60 x-ms-exchange-messagesentrepresentingtype: 1 x-tmn: [0NCaY1oI88FQqGlrv3It0mPz+pF0+Kf/] x-microsoft-original-message-id: <7295c2d2a1f43309b83978e409bcd768e303861a.camel@hotmail.com> x-ms-publictraffictype: Email x-incomingheadercount: 60 x-eopattributedmessage: 0 x-microsoft-antispam: BCL:0; PCL:0; RULEID:(2390118)(7020095)(201702061078)(5061506573)(5061507331)(1603103135)(2017031320274)(2017031322404)(2017031323274)(2017031324274)(1601125500)(1603101475)(1701031045); SRVR:SN1NAM04HT248; x-ms-traffictypediagnostic: SN1NAM04HT248: x-microsoft-antispam-message-info: 4c/z5noOOUDIPOHqMCaowobedv6t3Dpi5KgW7rTDqdm8iaync5VkWbQnSGIKYxEF Content-ID: <8ABCEB273432EB418BB8A3AD238789AA@namprd12.prod.outlook.com> MIME-Version: 1.0 X-OriginatorOrg: hotmail.com X-MS-Exchange-CrossTenant-RMS-PersistedConsumerOrg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-CrossTenant-Network-Message-Id: 4c32cbe8-cec0-4cae-56be-08d69be77fdf X-MS-Exchange-CrossTenant-rms-persistedconsumerorg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-CrossTenant-originalarrivaltime: 26 Feb 2019 12:39:49.3600 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Internet X-MS-Exchange-CrossTenant-id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN1NAM04HT248 X-Mailman-Approved-At: Thu, 28 Feb 2019 19:16:51 +0100 X-BeenThere: wireguard@lists.zx2c4.com X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development discussion of WireGuard List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: wireguard-bounces@lists.zx2c4.com Sender: "WireGuard" Hi, I have Fiber to our apartment complex basement, from there Cat6 runs to each apartment. The ISP/apartment service provider suggests an MTU of 1448, which I set for the PPPoE interface on my OpenWRT router. I read https://lists.zx2c4.com/pipermail/wireguard/2017-December/002201.html which comes to (assuming 1500 byte MTU) to 60 bytes (IPv6) to 80 bytes less to account for Wireguard protocol overhead. Using this info, I tried an MTU of both (1448-80=1368) and (1448- 60=1388). As my ISP assigns only IPv4, I expected an MTU of 1388 to work, which I set on the Wireguard interface in OpenWRT. However, when set to 1388, almost everything works except any Google related sites like Maps, Gmail, YT etc. When set to 1368, everything works and it's the way I have it setup right now. What am I missing here? Why won't Google sites load via my WG VPN when the MTU is set to 1388? If it helps, I host the WG server on Google's cloud platform and was informed that GCP has an MTU of 1460 bytes. Thank you, S _______________________________________________ WireGuard mailing list WireGuard@lists.zx2c4.com https://lists.zx2c4.com/mailman/listinfo/wireguard