> On Aug 11, 2015, at 19:47 , Tom Samplonius <[email protected]> wrote: > > >> On Aug 11, 2015, at 7:36 PM, Paul <[email protected] >> <mailto:[email protected]>> wrote: >> >> Hello >> >> We are getting ready to lose a /22 and /23 and 2 /24's when we switch from >> microwave data center providers >> to fiber for our ISP that the data centers have been providing for us since >> the dial-up days . >> /22 and /23 are no longer available. Will we have to pay the $100 annual fee >> on each /24 block allocated >> even though nothing larger is available? Can we get an IPv6 allocation large >> enough when we file for AS number >> for a several month cross over from microwave to fiber? > > > Keep in mind that a IPv6 /32 or /36 are very large blocks in comparison to > a /21 worth of IPv4. > > A /32 allows you to assign a /64 each to about 4 billion customers.
That’s really not a good idea in most cases. For the most part, you should be assigning /48s to each customer end site. Some customers may have multiple end sites (more than one building, for example). Still, a /36 is enough to assign 4096 /48s and a /32 is 65,536 /48s, so they are still significantly larger than a /21 of IPv4. Owen
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