Re: [v6ops] About Req for Comments - "Transition to IPv6"

[Owen DeLong <[e-mail]>]

> On Mar 5, 2020, at 8:51 AM, Alexandre Petrescu <[e-mail]> wrote:
> 
> 
> 
> Le 05/03/2020 à 17:46, Owen DeLong a écrit :
>>> On Mar 5, 2020, at 6:02 AM, Alexandre Petrescu
>>> <[e-mail]> wrote:
>>> Thank you very much for the pointer.  In it I could spot the
>>> following footnote: "[4] IPv6-Only refers to network environments
>>> in which use of the IPv4 protocol has been eliminated.”
>> No.
>> IPv6-Only refers to network environments which are not using IPv4.
>> That could be a network where IPv4 has been eliminated (rare at this
>> time, though Facebook is a significant example) 
> 
> Is facebook a network?  I thought of it like a server farm.

How does one run a distributed server farm throughout the world without connecting it with a network? Am I missing something?

> or it could be a
>> greenfield deployment where IPv4 was never deployed.
>>> In my humble opinion,
>>> I think, if I am not wrong, that there are no such networks in
>>> which IPv4 protocol has been eliminated.  On one hand, a network is
>>> made of computers, and IPv4 stacks are still present in almost all
>>> computers. On another hand, there might be some ptp links (not
>>> networks, but individual links) that run IPv6 only.
>> You are wrong… There are examples at various levels of IPv6-only
>> networks. Many mobile carriers are IPv6-only in the US,
> 
> The IPv6-only of mobile carriers in the US - is it carried in IPv4?  The last packet dump I saw was IPv6 carried in IPv4.

At least on T-Mo, it appears to be native IPv6 from what I can see. However, if it’s tunneled in v4 somewhere, that would likely be entirely transparent and I’d have no way to tell.

Owen