On Wed, Aug 10, 2011 at 2:17 PM, Jeff Wheeler <jsw@inconcepts.biz> wrote:
On Wed, Aug 10, 2011 at 2:03 PM, Owen DeLong <owen@delong.com> wrote:
That said, /48 to the home should be what is happening, and /56 is a better compromise than anything smaller.
You don't really imagine that end-users will require more than 2^8 subnets, but that they will want several levels of very simple, nibble-aligned routers within their network?
Hi Jeff, In Owen's world, the refrigerator, toaster and microwave each request a /64 from the GE Home Appliance Controller, those /64's being necessary to address each appliance's internal button, light and sensor networks. To accommodate all of these appliances, the HAC has acquired a /59 for all the home appliances from the Home Automation System (HAS) which also has its own LAN and supplied a big block to the furnace and a smaller block to the security system. So, the HAS needed a /58 which it got from the Linksys Home Router. The Sony Home Entertainment Network (HEN) Controller also needed a /58 from the Home Router to accommodate the Playstation 5's need for a /62 (one /64 for its internal network, another for the PSN VPN and a third for the peripherals network). The Ultra-NES 512 only needed one /64, but the amplifier insisted on a /60 so it could delegate /64's to the cassette tape deck, cd player, mp3 player, etc. The Ford Home Automotive Network (HAN) also grabbed a block from which to delegate /62's to the three parked cars. Because you know: you need separate networks in each car for the life safety systems, the non-safety systems and the entertainment systems. I mean really, why wouldn't the life safety system in a car dynamically acquire its globally-addressable IPv6 addresses from the customer's cheap home Internet equipment? So they'll each need their /64's which means the car as a whole needs a /62. But the HAN only needed a /60 for for all of it since there were only 3 cars. Now, the Windows 9 PC sat on the /64 PC LAN directly connected to the Home Router, but it needed an additional /64 for its virtual machine network hosting the Windows XP VM needed to run older software. And the wireless LAN only ended up consuming a single /64. But after the two /58's, that meant the Home Router needed a full /56 from the Internet Router. Finally, the Internet Router connects two networks... the customer's web server DMZ (/64) and the home router (/56). So after you figure in the HAC, the HAN, the HAS, the HEN and all the other connections you need at least a /55... which doesn't fit in a /56 but does fit in a /48. Qed. * Now, in Bill's world, the appliances don't expose their internals. When they employ any form of IP networking inside, which they generally don't, they use fe80 link-local addresses inside or maybe a ULA prefix. So even you have a Smart Fridge within the time span that you care about for today's home user IPv6 assignments, it occupies a single public address on your home's flat /64. Ditto the game consoles and tape decks. With maybe two other /64's: one for servers and one for the wireless LAN. And that /62 need easily fits in your /56 assignment. Regards, Bill Herrin * I say this with trepidation. A quarter century ago I used a similar reductio ad absurdum with a friend who suggested making every road a toll road. "Back out of the driveway. Pay the toll. Turn on to main. Pay the toll. Left on 15th. Pay the toll." Wouldn't you know, E-Z Pass came along and brought it to the edge of possible. Then again, possible doesn't necessarily mean advisable. -- William D. Herrin ................ herrin@dirtside.com bill@herrin.us 3005 Crane Dr. ...................... Web: <http://bill.herrin.us/> Falls Church, VA 22042-3004