nanog mailing list archives
Re: Waste will kill ipv6 too
From: Mark Andrews <marka () isc org>
Date: Fri, 29 Dec 2017 15:36:51 +1100
On 29 Dec 2017, at 2:51 pm, valdis.kletnieks () vt edu wrote: On Thu, 28 Dec 2017 20:26:46 -0700, Brock Tice said:I will again say I am indeed no expert, I am happy to get feedback. Is there some kind of allocation scheme where a residential user or even a small or medium business will have any chance of using 4096 /64s?They won't burn 4096 consecutive addresses. They'll do what you said - your gear supplies their head-end router a /52. That then starts handing out a half-dozen or so /64s for hardware interfaces, and hands a DHCP-PD /56 to the expansion router at the other end of the house, which then hands out a half-dozen /64s for subnets at that end, and *it* then hands a /60 PD to the garage and barn routers, so they can each set up a half-dozen /64s.
PD is designed so that a device (router) can request multiple PD requests upstream. The interior router just needs to make a upstream request on behalf of the downstream device and any prefixes it will be allocating itself. There is zero need to maintain a pool of prefixes to answer prefix requests. If you get back a bigger (e.g. /48 sized response) you just use those until they have all been handed out.
So yeah, they need a /52, even though we've only burned through 2 or 3 dozen /64s. But this is the way it's *supposed* to work - note that careful choice of subnet numbers for the PD and local subnets means that even if other stuff shows up and starts asking for a PD, there will be plenty left for them to use.
-- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: marka () isc org
Current thread:
- Re: Waste will kill ipv6 too, (continued)
- Re: Waste will kill ipv6 too Randy Bush (Dec 29)
- Threads that never end (was: Waste will kill ipv6 too) Stephen Satchell (Dec 30)
- Message not available
- Re: Threads that never end (was: Waste will kill ipv6 too) sizone!math (Dec 30)
- Re: Threads that never end Large Hadron Collider (Dec 30)
- Re: Threads that never end (was: Waste will kill ipv6 too) Randy Bush (Dec 30)
- Re: Waste will kill ipv6 too Lyndon Nerenberg (Dec 28)
- Re: Waste will kill ipv6 too Lyndon Nerenberg (Dec 28)
- Re: Waste will kill ipv6 too Brock Tice (Dec 28)
- Re: Waste will kill ipv6 too Lyndon Nerenberg (Dec 28)
- Re: Waste will kill ipv6 too valdis . kletnieks (Dec 28)
- Re: Waste will kill ipv6 too Mark Andrews (Dec 28)
- Re: Waste will kill ipv6 too valdis . kletnieks (Dec 28)
- Re: Waste will kill ipv6 too Mark Andrews (Dec 28)
- Re: Waste will kill ipv6 too Owen DeLong (Dec 28)
- Re: Waste will kill ipv6 too Lyndon Nerenberg (Dec 28)
- Re: Waste will kill ipv6 too Ricky Beam (Dec 28)
- Re: Waste will kill ipv6 too Mark Andrews (Dec 28)
- Re: Waste will kill ipv6 too Owen DeLong (Dec 28)
- Re: Waste will kill ipv6 too bzs (Dec 28)
- Re: Waste will kill ipv6 too Owen DeLong (Dec 28)
- Re: Waste will kill ipv6 too bzs (Dec 28)