North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: NAT66 and the subscriber prefix length
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.) We have also started offering residential Internet to those living on campus, which has been very popular (no suprise.) If I'm expected to assign a /48 per residential user, I'm already out of address space. Should I be requesting a /32? Is it acceptable to carve the /32 up a little for IPv4 style multi-homing? I'd rather come to terms with this now before I do any meaningful deployment. Tim:>
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