On Aug 5, 2012, at 7:34 AM, Randy Bush wrote: >> In other words: I expect that it will be not more than 20 years from >> now that we will hear cries of "Why were we so wasteful with IPv6 >> addresses in the beginning?" This is why I disagree with Phillip >> Hallam-Baker's opinion. > > <aol> > > whatever the number of address bits, if it is fixed, we always run out. > memory addressing has been a cliff many times. ip addressing. ... > Yup. To quote Fred Brooks on memory address space: "Every successful computer architecture eventually runs out of address space" -- and I heard him say that in 1973. --Steve Bellovin, https://www.cs.columbia.edu/~smb