From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from emea01-am1-obe.outbound.protection.outlook.com (mail-am1on0099.outbound.protection.outlook.com [157.56.112.99]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client CN "mail.protection.outlook.com", Issuer "MSIT Machine Auth CA 2" (verified OK)) by huchra.bufferbloat.net (Postfix) with ESMTPS id 7F64121F1F9 for ; Tue, 28 Apr 2015 06:21:11 -0700 (PDT) Received: from HE1PR07MB0937.eurprd07.prod.outlook.com (25.162.27.143) by HE1PR07MB0922.eurprd07.prod.outlook.com (25.162.27.140) with Microsoft SMTP Server (TLS) id 15.1.148.16; Tue, 28 Apr 2015 13:21:07 +0000 Authentication-Results: lists.bufferbloat.net; dkim=none (message not signed) header.d=none; Received: from [IPv6:2001:470:183f:da2b::717c:e11c] (2001:470:183f:da2b::717c:e11c) by HE1PR07MB0937.eurprd07.prod.outlook.com (25.162.27.143) with Microsoft SMTP Server (TLS) id 15.1.148.16; Tue, 28 Apr 2015 13:21:05 +0000 Message-ID: <553F8932.6050009@darbyshire-bryant.me.uk> Date: Tue, 28 Apr 2015 14:20:50 +0100 From: Kevin Darbyshire-Bryant User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0 MIME-Version: 1.0 To: "cerowrt-devel@lists.bufferbloat.net" Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha1; boundary="------------ms000907020204060508020806" X-Originating-IP: [2001:470:183f:da2b::717c:e11c] X-ClientProxiedBy: DM2PR07CA0023.namprd07.prod.outlook.com (10.141.52.151) To HE1PR07MB0937.eurprd07.prod.outlook.com (25.162.27.143) X-Microsoft-Antispam: UriScan:; BCL:0; PCL:0; RULEID:; SRVR:HE1PR07MB0937; UriScan:; BCL:0; PCL:0; RULEID:; SRVR:HE1PR07MB0922; X-Forefront-Antispam-Report: BMV:1; SFV:NSPM; SFS:(10009020)(6009001)(164054003)(33656002)(5000100001)(19580395003)(450100001)(4001350100001)(40100003)(42186005)(19580405001)(80316001)(46102003)(36756003)(84326002)(5890100001)(2501003)(83506001)(110136001)(92566002)(87976001)(86362001)(59896002)(107886001)(65806001)(1720100001)(122386002)(512874002)(62966003)(568964001)(229853001)(65956001)(64126003)(87266999)(2351001)(77156002)(74482002)(15975445007)(54356999)(64706001)(50986999)(65816999)(568214008)(3826002); DIR:OUT; SFP:1101; SCL:1; SRVR:HE1PR07MB0937; H:[IPv6:2001:470:183f:da2b::717c:e11c]; FPR:; SPF:None; MLV:nov; PTR:InfoNoRecords; LANG:en; X-Microsoft-Antispam-PRVS: X-Exchange-Antispam-Report-Test: UriScan:; X-Exchange-Antispam-Report-CFA-Test: BCL:0; PCL:0; RULEID:(601004)(5002010)(5005006)(3002001); SRVR:HE1PR07MB0937; BCL:0; PCL:0; RULEID:; SRVR:HE1PR07MB0937; X-Forefront-PRVS: 0560A2214D X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Apr 2015 13:21:05.4413 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-Transport-CrossTenantHeadersStamped: HE1PR07MB0937 X-OriginatorOrg: darbyshire-bryant.me.uk Subject: [Cerowrt-devel] Link layer adaptation VDSL2 - Basis for 8 byte overhead? X-BeenThere: cerowrt-devel@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: Development issues regarding the cerowrt test router project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 28 Apr 2015 13:21:40 -0000 --------------ms000907020204060508020806 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi, Enquiring mind here :-) Reading http://www.bufferbloat.net/projects/cero= wrt/wiki/Everything_you_wanted_to_know_about_Link_Layer_Adaptation and th= e linked to email discussion, I'm curious as to where the 8 byte overhead= recommendation for VDSL2 comes from. Is this assumption that PPPoE is b= eing used? Based on that assumption it raises further questions in my mi= nd: My ISP supplier (Sky in the UK) provide straight ethernet over PTM, with = DHCP to obtain a public IP address, so in theory no PPPoE overhead unlike= other ISPs offering 'fibre' (ha!) broadband in the UK. There appears to= be a tagged VLAN on the WAN port, therefore I think the correct overhead= in my case is 4 (VLAN) and for everyone else it should be 12 (VLAN + PPP= oE) Please correct my assumptions :-) Kevin --=20 Thanks, Kevin@Darbyshire-Bryant.me.uk --------------ms000907020204060508020806 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIINnDCC BjQwggQcoAMCAQICAR4wDQYJKoZIhvcNAQEFBQAwfTELMAkGA1UEBhMCSUwxFjAUBgNVBAoT DVN0YXJ0Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNp Z25pbmcxKTAnBgNVBAMTIFN0YXJ0Q29tIENlcnRpZmljYXRpb24gQXV0aG9yaXR5MB4XDTA3 MTAyNDIxMDE1NVoXDTE3MTAyNDIxMDE1NVowgYwxCzAJBgNVBAYTAklMMRYwFAYDVQQKEw1T dGFydENvbSBMdGQuMSswKQYDVQQLEyJTZWN1cmUgRGlnaXRhbCBDZXJ0aWZpY2F0ZSBTaWdu 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