[ipv6-wg] Re: [address-policy-wg] IPv6 allocations for 6RD
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Mark Townsley
townsley at cisco.com
Fri Nov 27 16:56:26 CET 2009
michael.dillon at bt.com wrote: >>> There are only 2 reasons that I can see to write a special policy. >>> One is to encourage ISPs to assign /56 prefixes to customers, not >>> longer ones like /60. >>> >> Or /60s vs. /64s. I think you may be a little optimistic if >> you think that /60 is the low end of the totem pole here. >> > > I don't believe that RIR policy should ever encourage ISPs > to assign customer sites a prefix longer than /56. In fact, > we really should discourage assigning anything other than > a /48 or a /56 because part of the benefit of IPv6 comes > from giving the customers a spacious number space in which > they can subnet. This also allows for greater portability, > i.e. I can switch providers without changing my network > architecture, or I can relocate to another country and know > that I will get the same prefix length assignment. > > >> Case in point is that when Free first offered its IPv6 >> service, it did so within the /32 it had by giving /64s to >> all its customers. A few folks like myself complained, and >> they changed it only because they were able to get a large >> enough allocation from RIPE (which they had to go back and >> ask for). If that had not happened, it's not like Free would >> have ripped out its entire DSLAM infrastructure and upgraded >> it to offer a /60 or /56. The choice would have been /64 or >> nothing. Period. >> > > The point is that it did happen. RIPE did give them enough address > space to offer customers more than a /64. That is the way things > should be because there is no shortage of IPv6 address space. > > In fact, RIPE should refuse to give ISPs an allocation so small > that it forces them to offer customers anything longer than a > /56 prefix. > I'm sure Free would have been happy to get a /22 vs. a /26, and might even pass that on to its customers via a /56 vs. a /60. > > >> I'd be perfectly fine with no new policy, as long as ISPs, >> even relatively small ones, do not delay IPv6 deployment over >> lack of obtainable space. >> > > Yet another reason why RIPE should be liberal with IPv6 space. > > In IPv4, a /32 will number one host. In IPv6, the same prefix > will provide many ISPs enough address space to last them 20 > to 50 years. In IPv4, a /24 is something that you assign to > customers and a /21 is a small ISP. Why should we be more > restrictive in IPv6? I can see no good reason to not hand out > ISPs a /24 or a /21 if they need it to make their IPv6 access > service work. > I agree 100%, I'm just telling you my experience in talking with ISPs. In some cases, it starts with "why not a /128?" then once we get to the point that /64 is really the absolute minimum, then /56 is is the next target. It's often a battle just to get to that point though. > Even though my employer, a rather large ISP, expects to fit > within a /21 with native IPv6 services, I do not see the need > to require every other ISP to use their IPv6 allocation as > efficiently as we do. Cost efficiency is more important, and > if a medium sized ISP needs a /21 in order to get their IPv6 > service rolled out faster, then I believe we should give them > that /21. A /21 should be ample for any ISP to run 6rd and several other native services as well. > The sooner we get the IPv6 transition into full gear, the better > it will be for all of us. Network effects demand that we help our > competitors by removing any barriers that limit them or slow > them down. > Absolutely. The value of the network, and the protocol it runs on, is proportional to the square of the users of course. - Mark > --Michael Dillon > > >
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