[address-policy-wg] Re: [ipv6-wg] IPv6 PI
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Andre Oppermann
oppermann at networx.ch
Fri Nov 25 10:58:43 CET 2005
Roger Jorgensen wrote: > > On Thu, 24 Nov 2005, Florian Weimer wrote: > > * Roger Jorgensen: > > > > > Can't we all just drop using the word multihoming and IPv6 PI? > > > They all reflect back to how thing was done with IPv4 and those ways are > > > doomed to fail with IPv6 simply due to the size of the IP space. > > > > I'm a relative newcomer to this area. Could you give a pointer to > > some explanation *why* the IPv6 address space size causes this > > problem? > > Just do the math yourself and consider all possibilities and how the IPv4 > space are used... but some numbers > > - the address space is 128bit. > - we have a 64bits host prefix at the lower end. > - the above give us 64bits of network numbers, that's quite a few billions > of networks. BUT > - the /48 boundary leaving us with a usable globaly network space of 48bit > - from the 48bits only a /8 are usable as it is now, the other 7 /8 are > reserved for the future. > > The absolute max global routing table would by this be 40bits, of > course the real one are alot smaller. That one is closer to 32bits, and > that is STILL A huge number, probably more close to 20bits of entries. > > a last comment: the entire idea behind /64 and /48 will cause IPv6 to fail > as it is now. Odd as it is, we don't have enough IP space in IPv6. Sure it > will last 10, maybe 15-20 years, but that did IPv4 to...... You post is still pretty content-free. You're waving with your hand but what do you propose exactly? I've posted my proposals under "Andre's guide to fix IPv6". When do you with yours? -- Andre
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