<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <meta name="Generator" content="Microsoft Word 15 (filtered medium)"> <style></style> </head> <body lang="DE" link="#0563C1" vlink="#954F72"> <div class="WordSection1"> Dear RIPE members and community,<o:p></o:p> <o:p> </o:p> <h1 style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:9.0pt;margin-left:0cm;line-height:15.6pt;background:white"> We have come across a question of correct interpretation for “utilization” wthin�the current “IPv6 Address Allocation and Assignment Policy“ RIPE-738 document:<o:p></o:p></h1> <h4 style="mso-margin-top-alt:9.0pt;margin-right:0cm;margin-bottom:9.0pt;margin-left:0cm;mso-line-height-alt:15.6pt;background:white"> <o:p> </o:p></h4> <h4 style="mso-margin-top-alt:9.0pt;margin-right:0cm;margin-bottom:9.0pt;margin-left:0cm;mso-line-height-alt:15.6pt;background:white"> 5.2.2. Applied HD-Ratio<o:p></o:p></h4> <p style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:9.0pt;margin-left:0cm;background:white;box-sizing: border-box;max-width: 700px;font-variant-ligatures: normal;font-variant-caps: normal;orphans: 2;text-align:start;widows: 2;-webkit-text-stroke-width: 0px;text-decoration-style: initial;text-decoration-color: initial;word-spacing:0px"> The HD-Ratio value of 0.94 is adopted as indicating an acceptable address utilisation for justifying the allocation of additional address space.<o:p></o:p> Appendix A provides a table showing the number of assignments that are necessary to achieve an acceptable utilisation value for a given address block size.<o:p></o:p> <h1 style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:9.0pt;margin-left:0cm;line-height:15.6pt;background:white"> […]<o:p></o:p></h1> <h2 style="mso-margin-top-alt:9.0pt;margin-right:0cm;margin-bottom:9.0pt;margin-left:0cm;mso-line-height-alt:15.6pt;background:white"> 10. Appendix A: HD-Ratio<o:p></o:p></h2> <p style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:9.0pt;margin-left:0cm;background:white;box-sizing: border-box;max-width: 700px;font-variant-ligatures: normal;font-variant-caps: normal;orphans: 2;text-align:start;widows: 2;-webkit-text-stroke-width: 0px;text-decoration-style: initial;text-decoration-color: initial;word-spacing:0px"> The utilisation threshold T, expressed as a number of individual /56 prefixes to be allocated from IPv6 prefix P, can be calculated as:<o:p></o:p> <div style="border:solid #CCCCCC 1.0pt;padding:7.0pt 7.0pt 7.0pt 7.0pt"> <pre style="margin-bottom:7.5pt;background:whitesmoke;box-sizing: border-box;overflow-wrap: break-word;border-radius: 4px;white-space:pre-wrap;font-variant-ligatures: normal;font-variant-caps: normal;orphans: 2;text-align:start;widows: 2;-webkit-text-stroke-width: 0px;text-decoration-style: initial;text-decoration-color: initial;overflow:auto;word-spacing:0px">T = 2((56-P)*HD)<o:p></o:p></pre> </div> <p style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:9.0pt;margin-left:0cm;background:white;box-sizing: border-box;max-width: 700px;font-variant-ligatures: normal;font-variant-caps: normal;orphans: 2;text-align:start;widows: 2;-webkit-text-stroke-width: 0px;text-decoration-style: initial;text-decoration-color: initial;word-spacing:0px"> Thus, the utilisation threshold for an LIR requesting subsequent allocation of IPv6 address block is specified as a function of the prefix size and target HD ratio. <o:p></o:p> This utilisation refers to the use of /56s as an efficiency measurement unit, and does not refer to the utilisation of addresses within those End Sites. <o:p></o:p> It is an address allocation utilisation ratio and not an address assignment utilisation ratio.<o:p></o:p> <h1 style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:9.0pt;margin-left:0cm;line-height:15.6pt;background:white"> […]<o:p></o:p></h1> <h1 style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:9.0pt;margin-left:0cm;line-height:15.6pt;background:white"> <o:p> </o:p></h1> The two underlined sentences seem to contradict each other.<o:p></o:p> For a correct interpretation and calculation of the HD-Ratio/Utilization-Threshold (T) for IPv6-subsequent block eligibility, what is now correct “allocation” or “assignment” ?<o:p></o:p> <o:p> </o:p> In the LIR-Portal there is an %-indication for “my own resources” which soley refers to assignments within a specific block. Allocations seem not to be considered.<o:p></o:p> <o:p> </o:p> What is the correct way to calculcate the utilization?<o:p></o:p> <o:p> </o:p> Best regards,<o:p></o:p> on behalf<o:p></o:p> Kurt Kayser<o:p></o:p> _______________________<o:p></o:p> Kurt Kayser Konsultation<o:p></o:p> im Auftrag des Referates SK 4 - Konzeption/ Local Internet Registry<o:p></o:p> Bundesanstalt f�r den Digitalfunk der Beh�rden und Organisationen mit Sicherheitsaufgaben (BDBOS)<o:p></o:p> Telefon: +49 (0) 1575-2634020<o:p></o:p> E-Mail: <a href="mailto:Kurt.Kayser@bmi.bund.de">Kurt.Kayser@bmi.bund.de</a><o:p></o:p> Internet: <a href="http://www.bmi.bund.de/">www.bdbos.bund.de</a><o:p></o:p> <o:p> </o:p> </div> </body> </html>