Hemant, Fair enough. I suppose that there are enough /55's or /56's that every household can have one; however, it does make "right sizing" the initial allocation to the ISP very important. We would not want to be allocating non-contiguous /28's on a regular basis :-) Best Regards, Jeffrey Dunn Info Systems Eng., Lead MITRE Corporation. (301) 448-6965 (mobile) -----Original Message----- From: Hemant Singh (shemant) [mailto:shemant@xxxxxxxxx] Sent: Friday, November 06, 2009 8:07 PM To: Dunn, Jeffrey H.; Wes Beebee (wbeebee); Antonio Querubin Cc: Thomas Narten; Fred Baker (fred); 6man-ads@xxxxxxxxxxxxxx; SAVI Mailing List; william.allen.simpson@xxxxxxxxx; Hesham Soliman; IETF@xxxxxxxxxxxxxx; Erik Nordmark; savi-ads@xxxxxxxxxxxxxx; IPv6 Operations; Susan Thomson (sethomso); v6ops-ads@xxxxxxxxxxxxxx; Robin Mersh; Mailing List; Susan@xxxxxxxxxxxxxx; JINMEI Tatuya / 神明達哉 Subject: RE: Fwd: Broadband Forum liaison to IETF on IPv6 security Jeffrey, The answer to your question is a yes. Alternatively, the ISP may just dole out a delegated prefix shorter than a /64 and the CPE Rtr has to live with it but the ISP may use something like a /55 that gives sufficient number of links in the home LAN. I will reply to any more discussion on this thread once I reach Hiroshima. Hemant -----Original Message----- From: Dunn, Jeffrey H. [mailto:jdunn@xxxxxxxxx] Sent: Friday, November 06, 2009 7:31 PM To: Hemant Singh (shemant); Wes Beebee (wbeebee); Antonio Querubin Cc: Thomas Narten; Fred Baker (fred); 6man-ads@xxxxxxxxxxxxxx; SAVI Mailing List; william.allen.simpson@xxxxxxxxx; Hesham Soliman; IETF@xxxxxxxxxxxxxx; Erik Nordmark; savi-ads@xxxxxxxxxxxxxx; IPv6 Operations; Susan Thomson (sethomso); v6ops-ads@xxxxxxxxxxxxxx; Robin Mersh; Mailing List; Susan@xxxxxxxxxxxxxx; JINMEI Tatuya / 神明達哉; Dunn, Jeffrey H. Subject: RE: Fwd: Broadband Forum liaison to IETF on IPv6 security OK. Then the CPE router has a unique /64 for all of its broadcast domains? Does that mean that the customer needs to tell the ISP how many /64 prefixes they need? Best Regards, Jeffrey Dunn Info Systems Eng., Lead MITRE Corporation. (301) 448-6965 (mobile) _______________________________________________ Ietf mailing list Ietf@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf