Re: [homenet] Support for RFC 7084 on shipping devices...

"Pascal Thubert (pthubert)" <pthubert@cisco.com> Mon, 07 October 2019 10:38 UTC

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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Ole Troan <otroan@employees.org>
CC: Ted Lemon <mellon@fugue.com>, Markus Stenberg <homenet@ietf.org>, 6MAN <6man@ietf.org>
Thread-Topic: [homenet] Support for RFC 7084 on shipping devices...
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Date: Mon, 7 Oct 2019 10:37:58 +0000
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Subject: Re: [homenet] Support for RFC 7084 on shipping devices...
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Hello Ole and Ted:

> 
>>> Sounds like you need to set it up as a NAT.
>> 
>> I really hope you are just making a funny joke here.   But it’s not very funny.   What I want is something that’s operationally simple, not something with lots of moving parts that have to be kept track of.   NATs in particular suck for any UDP-based protocol.
> 
> for "permissionless extensions of the network" there isn't much else than NAT.
> Your other likely option is an ND proxy. If you are very sure that nothing else can be added to the network (we don't want to build a spanning tree protocol out of ND).

Agreed that ND proxy is not an alternative for routing. It is a one hop extension around a transit link and nothing more. For deeper ”mesh” extensions there are millions of nodes deployed out there that use RPL quite successfully.

The design allows to combine the 2 with a high speed backbone (Ethernet) and RPL meshes ganging off ND proxies. 

But inside a subnet RPL is used to route to hosts so there is no subnet assignment just SLAAC or DHCP. Still those networks scale to ~ten thousand. Good enough for home for a long time. 



> 
>>> I wasn't thinking of doing it exactly like the 6lowpan does it.


Too bad then... I still fail to see why the model cannot be generalized to more powerful nodes.

Anyway a transit and one level of proxy already takes us a long way.

All the best,

Pascal
>