Re: [v6ops] How can one check the presence of IPv4aaS technologies? -- Re: draft-vf-v6ops-ipv6-deployment

Although there is  the word of "Service" in this term, it does not mean this is a marketing term, my understanding is that it only defines the role of remaining IPv4 traffic in IPv6-only network. Considering IPv4 traffic will not vanish in short term, so IPv4aaS will stay long and be a major feature of IPv6-only network.

Chongfeng

xiechf@chinatelecom.cn

From: Alexandre Petrescu
Date: 2021-03-29 22:06
To: v6ops
Subject: Re: [v6ops] How can one check the presence of IPv4aaS technologies? -- Re: draft-vf-v6ops-ipv6-deployment
I think we should first say what one means by 'IPv4aaS'.

I think this term is very loosely defined technically.

It might be a very good marketing term, and an excellent overall goal 
for developments of features on roadmaps.

But I have some ideas about how to check what you ask.

Le 29/03/2021 à 10:40, Lencse Gábor a écrit :
> 
> 24/03/2021 17:22 keltezéssel, Alexandre Petrescu írta:
> 
> [...]
> 
>> 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?
>>
> 
> I can imagine two situations:
> 
> 1. The user can configure in the CPE, which IPv4aaS technology is to be 
> used. (Or at least it is displayed for the user without the opportunity 
> to change the settings.)
> 
> This is the trivial case.
> 
> 2. Even though one of the above mentioned IPv4aaS technologies is used, 
> the CPE hides it from the user.
> 
> Of course, all five IPv4aaS technologies try to imitate the situation of 
> carrier grade NAT for IPv4. The question is, whether the user can point 
> out the fact the an IPv4aaS technology is used, and possibly also 
> determine its kind.
> 
> Now, again, we may distinguish two cases:
> - If the user can observe the traffic on the outside (WAN) interface of 
> the CPE (e.g. using tcpdump, tshark, etc.), then it is quite easy.
> - If the user cannot do that, then it is really interesting.
> 
> Can anyone recommend a suitable method for the second case?

One could check tables of IP addresses of DNS64 resolvers offered by 
some operators to their respective users (but not to others).  Such a 
table is available for all operators in France, at regulator.  On page 
57 of the pdf at this URL one can see such a table
https://en.arcep.fr/uploads/tx_gspublication/report-state-internet_2020-edition_250620-ENG.pdf

If a provider provides a DNS64 resolver it is highly likely that end 
users might benefit from some features of the concept 'IPv4aaS'.

> Do you know such properties of the user side behavior (e.g. traffic 
> pattern) of any of the 464XLAT, DSLITE, MAP-E, MAP-T or lw4o6 
> technologies that could indicate their presence?

That is an excellent question.  I think it is possible to write a packet 
analyzer that looks at the interface of the end user and depending on 
the contents of the packets to determine a pattern telling whether or 
not 464XLAT is used.

From these two things (tables of DNS64 resolvers, and packet 
analyzers), it might be possible to build web sites that not only reply 
to the question "what is my IP address" but also tell whether "IPv4aaS" 
is used or not.

Also, right now a "what is my IP addreess" website replies my
with my IP address, but can also tell whether I am behind a NAT or not.
  A similar logic could be used to tell whether I am behind a another
sort of address translation.

Alex

> 
> Gábor
> 
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