What about dual-homed customers? Or are they all expected to have their own PI space? Chuck -----Original Message----- From: NANOG [mailto:nanog-bounces@nanog.org] On Behalf Of Mel Beckman Sent: Tuesday, July 14, 2015 4:33 PM To: Valdis.Kletnieks@vt.edu Cc: John Levine; nanog@nanog.org Subject: Re: Dual stack IPv6 for IPv4 depletion Ok. Two RIB entries for Comcast. Your argument doesn't scale. -mel via cell On Jul 14, 2015, at 12:53 PM, "Valdis.Kletnieks@vt.edu<mailto:Valdis.Kletnieks@vt.edu>" <Valdis.Kletnieks@vt.edu<mailto:Valdis.Kletnieks@vt.edu>> wrote: On Tue, 14 Jul 2015 19:45:42 -0000, Mel Beckman said: We're talking about end user assignments made by ISPs, not ISP assignments. Do the math for how big a chunk Comcast needs, assuming they give each residential customer a /60, or a /56, or a /48. If their first chunk was sized based on ubiquitous /56s and it turns out /48 would have been better, they may need another trip to the well.