Patrick W. Gilmore wrote: > On Feb 4, 2009, at 7:08 PM, Seth Mattinen wrote: >> Patrick W. Gilmore wrote: >>> > >>> Second, where did you get 4 users per /64? Are you planning to hand >>> each cable modem a /64? >> >> >> That was the generally accepted subnet practice last time I had a >> discussion about it on the ipv6-ops list. I'm not an ISP, but I have a >> /48 and each subnet is a /64. Some devices will refuse to work if you >> subnet smaller than a /64. (Yes, poorly designed, etc.) > > I Am Not An ISP either. :) > > I guess I was thinking about v4 modems which do not get a subnet, just > an IP address. If we really are handing out a /64 to each DSL & Cable > modem, then we may very well be recreating the same problem. > > And before anyone says "there are 281474976710656 /48s!", just > remember your history. I was not there when v4 was spec'ed out, but I > bet when someone said "four-point-two BILLION addresses", someone else > said "no $...@#%'ing way we will EVER use THAT many...." >
Ah, but RFC 760, before 791, did assume "more than 253 networks? Nahhh..."