Subj : List of IPv6 nodes
To   : Alexey Vissarionov
From : Michiel van der Vlist
Date : Tue Jan 18 2022 02:06 pm

Hello Alexey,

On Monday January 17 2022 00:38, you wrote to Richard Menedetter:

 RM>> Sure ... I agree. My reply was more from the ISP point of view.
 RM>> With 1 v6 subnet it is easy, you just announce the subnet.

 AV> No: when you need to provide the customer with IPv6, you assign one
 AV> fixed address for a link, and route a /64 subnet through that address.

 AV> Plastic routers (those sold for 20 EUR) deal with this setup just
 AV> fine.

My provider issued "plastic box" already uses three subnets all by itself. The 
first subnet is routed to the local LAN. (WiFi + wired). The second subnet is 
rserverd for the private guest network. (WiFi only). The third subnet is for 
the providers own guest network. (WiFi only).

The box supports pefix delegation, so I can connect another router and have 
more subnets routed to that router.

 RM>> If you allow more, you need a way to configure them. (eg. VLANs,
 RM>> different subnet on different LAN port, etc.)

 AV> Or simply route more /64 subnets through that address. Or /56 at once.

My provider gives me a /56 routed through that "plastic box".

 RM>> That is added complexity for a low cost product, where most of
 RM>> your residential customers will have no clue what this is all
 RM>> about. So it makes more sense to offer that on higher tier (and
 RM>> more expensive) services.

 AV> That violates the KISS principle.

Indeed. It is easier to just give every customer a /56. And just route the 
first /64 to the LAN, so that the user need not configure anything if he only 
needs one /64. And the provider does not need to configure anything if the 
customer needs more.


Cheers, Michiel

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