North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: NAT66 and the subscriber prefix length
On Tue, Nov 18, 2008 at 2:33 PM, Crist Clark <[email protected]>wrote: > >>> On 11/18/2008 at 11:03 AM, "Tim Durack" <[email protected]> wrote: > > On Fri, Nov 14, 2008 at 2:28 PM, Mikael Abrahamsson <[email protected] > >wrote: > > > >> On Fri, 14 Nov 2008, [email protected] wrote: > >> > >> Not long ago, ARIN changed the IPv6 policy so that > >>> residential subscribers could be issued with a /56 > >>> instead of the normal /48 assignment. This was done > >>> so that ISPs with large numbers of subscriber sites > >>> would not exhaust their /32 (or larger) allocations > >>> too soon. Since these ISPs are allowed to assign > >>> a /56 to residential subscriber sites, their initial > >>> IPv6 allocation will last a lot longer and they won't > >>> have to apply for an additional allocation while > >>> everyone is getting up to speed with an IPv6 Internet. > >>> > >> > >> We returned our /32 for a /25 (with /22 being reserved) and current plan > is > >> to hand out /48s to everybody (unless they need even more space, then > >> they'll have to apply). > >> > >> So, doing /56 to end users just because you happen to have a /32 right > now > >> sounds like a bad plan, it doesn't take that many hours to get a larger > >> space if you can justify it (which wasn't that hard for us). > >> > >> We received our /32 (as a /35 I think) back in 2000 or so, policy has > >> changed since then, with RIPE it's not that hard to get a much larger > space > >> with a long term growth plan. My hope is that we'll make do with this > /22 > >> space for at least 5-10 years (67 million customer /48s is quite a lot), > >> unless something really big happens, and then we'll just have to get an > even > >> larger space. > >> > >> So message should be that /48 to end users is the way to go, and this > >> should suit residential and SME market without any additional > administrative > >> overhead depending on customer size. > >> > >> -- > >> Mikael Abrahamsson email: [email protected] > >> > >> > > This raises questions for me: we are a mixed enterprise/campus > environment. > > Recently got a /45 assigned, so we have a /48 per site (it was some work > to > > convince ARIN that fancy subnetting to make a /46 stretch a little > further > > made no sense.) > > A /45? I thought all allocations were on nibble borders for > IP6.ARPA considerations. > > 2620:0000:/23 is PI. ARIN makes assignments to end user sites of anywhere between /48 and /40, depending on your justification. ARIN wanted to give us a /46 for 5 sites, which made no sense. We pushed back for a /45, and that's what they gave us. Still not convinced it's going to be enough. Tim:>
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