nanog mailing list archives
Re: Stupid Ipv6 question...
From: "Stephen Sprunk" <stephen () sprunk org>
Date: Fri, 19 Nov 2004 09:36:11 -0600
Thus spake "Dan Mahoney, System Admin" <danm () prime gushi org>
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 theK5SSS dice at every possible opportunity." --Stephen Hawking
Current thread:
- Stupid Ipv6 question... Dan Mahoney, System Admin (Nov 19)
- Re: Stupid Ipv6 question... Stephane Bortzmeyer (Nov 19)
- Re: Stupid Ipv6 question... Dan Mahoney, System Admin (Nov 19)
- Re: Stupid Ipv6 question... Stephen Sprunk (Nov 19)
- Re: Stupid Ipv6 question... Lars Erik Gullerud (Nov 19)
- Re: Stupid Ipv6 question... Leo Bicknell (Nov 19)
- Re: Stupid Ipv6 question... Kevin Loch (Nov 19)
- RE: Stupid Ipv6 question... Scott Morris (Nov 19)
- Re: [nanog] RE: Stupid Ipv6 question... Dan Mahoney, System Admin (Nov 19)
- RE: [nanog] RE: Stupid Ipv6 question... Scott Morris (Nov 19)
- Re: Stupid Ipv6 question... Lars Erik Gullerud (Nov 19)
- Re: Stupid Ipv6 question... Stephane Bortzmeyer (Nov 19)
- Re: Stupid Ipv6 question... James (Nov 19)
- Re: Stupid Ipv6 question... Crist Clark (Nov 19)
- Re: Stupid Ipv6 question... Kevin Oberman (Nov 20)
- Re: Stupid Ipv6 bmanning (Nov 20)