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RE: draft-bourbaki-6man-classless-ipv6-00

"Templin, Fred L" <Fred.L.Templin@boeing.com> Fri, 02 June 2017 20:14 UTC

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From: "Templin, Fred L" <Fred.L.Templin@boeing.com>
To: "Manfredi, Albert E" <albert.e.manfredi@boeing.com>
CC: IETF IPv6 Mailing List <ipv6@ietf.org>
Subject: RE: draft-bourbaki-6man-classless-ipv6-00
Thread-Topic: draft-bourbaki-6man-classless-ipv6-00
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Date: Fri, 02 Jun 2017 20:14:11 +0000
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References: <20170602141112.x64nleqclygz7dwd@Vurt.local> <20170602141259.GD30896@gir.theapt.org> <CAKD1Yr0DtQYvCYLQexhXe_nhb5rjeyhnB4bCveqyO5Xbuwdg1A@mail.gmail.com> <20170602145655.msfjw35qhoev4sm2@Vurt.local> <CAKD1Yr3gqFgq3dxFaBEV++q5cgx1AHzFLGRJ50DYJjVE69C7iA@mail.gmail.com> <f2260ee557014429a1fef32de040547b@XCH15-06-11.nw.nos.boeing.com> <d62ce5e3ea0f486eb4c9d54609a86b24@XCH15-06-08.nw.nos.boeing.com> <04bdfdfe018145e6aedbaa62ed6cbfb0@XCH15-06-11.nw.nos.boeing.com> <78fe298cb5484d50a56cf6ed4ddafb54@XCH15-06-08.nw.nos.boeing.com> <6bba4c2b58964787860f2c7acf130959@XCH15-06-11.nw.nos.boeing.com>
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Bert, I think you are either not reading or not understanding what I am writing.
It must be the former, because what I am writing is not complicated.

Another question that we would have to ask is what is the longest prefix that
we should expect an ISP (or a core Internet router, for that matter) to carry
in its routing tables? A /80? A /96?

Thanks - Fred

> -----Original Message-----
> From: Manfredi, Albert E
> Sent: Friday, June 02, 2017 1:04 PM
> To: Templin, Fred L <Fred.L.Templin@boeing.com>
> Cc: IETF IPv6 Mailing List <ipv6@ietf.org>
> Subject: RE: draft-bourbaki-6man-classless-ipv6-00
> 
> -----Original Message-----
> From: Templin, Fred L
> 
> > My meaning was for the ISP to give the cell phone or home gateway
> > a /64, then let the cell phone/ home gateway subnet the /64 to
> > the IoT devices within the subnetwork it provides as it sees fit.
> 
> Sorry, I have to make an important correction:
> 
> Presumably, using some sort of internal address format, also /64, such as privacy addresses? Yes, true, but ...
> 
> I'd only make two observations. If the internal address scheme is globally routable, then you can't escape that fact that your ISP is
> going to have to list potentially many, many routes, reachable through that smartphone's (or home gateway, or internal IoT device
> gateway) /64. This state of affairs is not desirable.
> 
> If the internal address structure is not *globally* routable, the obvious example being ULAs, then we're back to requiring a NAT.
> 
> So a hard /64 boundary limits expansion at the edges, unless we use a NAT. Without resorting to a NAT, your ISP will have something
> to say about what you do, it seems to me. And of course, "ISP" is only to put the problem in terms a home user will understand. The
> same general issue arises with any network.
> 
> Bert

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