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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Stupid Ipv6 question...
Thus spake "Dan Mahoney, System Admin" <[email protected]> I'm having trouble wrapping my head around ipv6 style suffixes -- does anyone have a chart handy? How big is a /64, specifically?Subnet sizes work a bit differently in IPv6 due to autoconfiguration; nearly all subnets are expected to be /64, which can hold up to 18,446,744,073,709,551,616 hosts. A /48, the minimum assignment to end sites (unless proven to need only a single /64), comprises 65,536 subnets. A /32, the minimum allocation to ISPs, comprises 65,536 /48s. Of course, the minimum allocation sizes may be changed (up or down) in the future by RIR policy actions, and ISPs or end-sites can get shorter prefixes with proper justification. /127 prefixes are assumed for point-to-point links, and presumably an organization will divide up a single /64 for all ptp links -- unless they have more than 9,223,372,036,854,775,808 of them. S Stephen Sprunk "God does not play dice." --Albert Einstein CCIE #3723 "God is an inveterate gambler, and He throws the K5SSS dice at every possible opportunity." --Stephen Hawking
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