Re: [v6ops] draft-vf-v6ops-ipv6-deployment

[Alexandre Petrescu <[e-mail]>]

Le 25/03/2021 à 10:15, JORDI PALET MARTINEZ a écrit :
> Free was using 6RD initially, not sure if they turned into
> dual-stack, may be with IPv4 via CGN.

I dont know (?), I am an end user.

For the moment I am happy with the way my ISP presents my access with
respect to IPv4 and IPv6 to the Internet.

There are some improvements necessary, with respect to SLAAC+DHCP, and
with respect to PD...

For example, if I turn on DHCPv6 on my freebox then my Android tablet
stops working even though my Windows PC works ok.  Ideally, DHCPv6 and
SLAAC should work ok together.

Also, if I add IPv6 subnets in my home then I must manually configure
the next-hop address in the GUI on the freebox, to tell that a prefix
P1::/63 (or so) to point to a particular IPv6 address.  Ideally, this
should be auto-configured, with tools and protocols that exist on client
Hosts.

Alex

> 
> Regards, Jordi @jordipalet
> 
> 
> 
> El 24/3/21 17:23, "v6ops en nombre de Alexandre Petrescu"
> <[e-mail] en nombre de [e-mail]>
> escribió:
> 
> 
> 
> Le 24/03/2021 à 16:59, Gabor LENCSE a écrit :
>> Dear Alex,
>> 
>> On 3/24/2021 4:12 PM, Alexandre Petrescu wrote: [...]
>>> Does IPv6 mandate the use of DNS64 and NAT64?
>> 
>> Of course, not. :)
> 
> So I agree with you about that.
> 
>> There are several IPv4 as a Services solutions exist. We have 
>> covered the five most prominent ones 464XLAT, DS-Lite, MAP-E,
>> MAP-T and lw4o6 in our I-D: 
>> https://tools.ietf.org/html/draft-lmhp-v6ops-transition-comparison-06
>
>>  Your ISP is likely using one of them.
> 
> For clarification - my ISP is called 'Free' (it has freedom
> features).
> 
> They offer me paid IPv4 and IPv6 native access at home on ADSL.
> It's one publicly routable IPv4 address and an IPv6 /56 prefix
> globally routable prefix (a 'GUP' if I can say so, not a
> GUA'(ddress)).
> 
> Up to now, looking through the configuration interface of my freebox
> at home I could not see the options that you mention (464XLAT,
> DSLITE, MAP-E, MAP-T, lw4o6).  One might say that they are there
> invisible, but I doubt that, I need a proof of it.  How can I check
> for presence of options 464XLAT, DSLITE, MAP-E, MAP-T or lw4o6?
> 
> The problems that appear when I try to browse IPv6 sites that
> absolutely need IPv4 might be because I turned off the IPv4 stack on
> my computer's interface (Windows Properties on the Interface, check
> off IPv4).  This operation (turning off IPv4 in a computer) is
> possible only on Windows, not on linux, AFAIR.  One cant do 'rmmod
> ipv4' in linux.
> 
> That also explains the fact that installing IPv4-IPv6 translation
> boxes (NAT64, 464LAT, etc.) in a network is not sufficient to access
> IPv4 sites from an IPv6-only computer.
> 
> In order to access IPv4 sites from IPv6-only computers one also
> needs the IPv4 stack to work ok on that computer and, moreover, it
> needs some times software features in the Client that support the
> 64:: notation of IPv6 addresses.  For example, thunderbird (a very
> modern MUA) does not understand it and gets confused by it.  It takes
> it for an fqdn, and does not even try to connect the translation
> boxes.
> 
> This means that if one wants to migrate more to IPv6 then one has to 
> think about the NAT64 and 464XLAT concepts more outside of the
> cellular network concept.
> 
> And yes, I agree with you, NAT64 and 464XLAT are good tools to 
> migrate.  In particular, if one is on a smartphone or other computer 
> using an OS that cant turn off their IPv4 stacks.
> 
> Alex
> 
>> 
>> Best regards,
>> 
>> Gábor
>> 
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