North American Network Operators Group|
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Re: NAT66 and the subscriber prefix length
>>> 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.