[ipv6-wg at ripe.net] What is a site?
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Gert Doering
gert at space.net
Mon May 9 13:30:46 CEST 2005
Hi, On Mon, May 09, 2005 at 01:16:48PM +0200, Iljitsch van Beijnum wrote: > >This is not the scenario where /128 would be used for. > > Right, I got the /64 and /128 problems mixed up. > > The above shows that a /64 is problematic. :-) Only if you assume numbered PPP links. Which is no way mandatory (nor useful towards single-LAN customers). > But how would a /128 work? > > >+---------------+ +---------------------+ > >|ISP dial-up box+-ppp-+customer dial-up HOST+ > >+---------------+ +---------------------+ > > Stateless autoconfiguration only works on /64s because it needs a 64 > bit interface identifier. So? Please re-read what I wrote. IPv6CP negotiates a host-ID - if the "ISP dial-up box" makes sure that all customer host IDs connecting to it are unique, you have unique interface identifiers. Then send the same (!) /64 RA on all links. Each host will assign itself a unique IP address, and send packets for all other addresses in the /64 towards the ISP (remember: this is a point-to-point link, there is no other way to send it to). The ISP router needs a bit more brains, but not very much so. (This is conceptually not overly different from the way IPv4 DHCP works on DSL lines in some bridged-mode deployments today - all DSL lines share a "virtual" bridged /24 or similar, so you don't need a /30 per DSL customer) Gert Doering -- NetMaster -- Total number of prefixes smaller than registry allocations: 71007 (66629) SpaceNet AG Mail: netmaster at Space.Net Joseph-Dollinger-Bogen 14 Tel : +49-89-32356-0 D- 80807 Muenchen Fax : +49-89-32356-234
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