Subj : A small questionary on ISPs
To   : Victor Sudakov
From : Michiel van der Vlist
Date : Sat Oct 16 2021 14:13:43

Hello Victor,

On Saturday October 16 2021 18:06, you wrote to me:

 MV>> I think #3 comes closest.

 VS> Thanks for replying.

You'r welcome.

 MV>> I am not sure about the /64 for the link. The only visible part
 MV>> of the link is the IPv6 WAN address of the router. It is outside
 MV>> the /56 assigned to the user, the link may just use a /128.

 VS> Do you see the WAN address of the router in the `traceroute -6`
 VS> output?

No.

 MV>> The modem/router supplied by the ISP assigns one /64 for the LAN
 MV>> and another /64 for the guest network. More /64 out  of the /56
 MV>> can be obtained by connecting extra routers.

 VS> Very little flexibility IMHO. Can you at least assign a static IPv6
 VS> address within the LAN /64?

Sure. How do you think I got my f1do address?

 MV>> For IPv6 one must use the modem/router from the provider. When
 MV>> the modem/router from the provider is set in bridge mode, the
 MV>> connection becomes IPv4 only.

 VS> This looks very similar to what I've heard from a Rostelecom
 VS> representative. This probably means that the IPv6 is not really
 VS> "native" and there is some kind of tunnel terminated at the
 VS> provider-owned CPE.

The odd thing is that on a premium bussines account there is no such restriction. With such an account one has dual stack with the modem in bridge. So I don't think your theory is correct.


Cheers, Michiel

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