nanog mailing list archives

Re: One Can't Have It Both Ways Re: Streamline the CG-NAT Re: EzIP Re: IPv4 address block


From: Christopher Hawker <chris () thesysadmin au>
Date: Tue, 16 Jan 2024 09:14:58 +1100

You most certainly can, it's called a VPN. One side initiates a connection
to the other.

;)

Regards,
Christopher Hawker

On Tue, 16 Jan 2024 at 07:21, Abraham Y. Chen <aychen () avinta com> wrote:

Hi, Forrest:

1)    I have a question:

    If I subscribe to IPv6, can I contact another similar subscriber to
communicate (voice and data) directly between two homes in private like the
dial-up modem operations in the PSTN? If so, is it available anywhere right
now?

Regards,


Abe (2024-01-15 15:20)


Let me start with I think we're largely on the same page here.

The transition I see happening next is that the consumer traffic largely
moves to IPv6 with no CG-NAT.  That is, if you're at home or on your phone
watching video or doing social media or using whatever app is all the rage
it's going to be over IPv6.

My point was largely that I believe that at some point the big consumer
(not business) focused companies are going to realize they can use market
forces to encourage the remaining IPv4-only eyeball networks to transition
to support IPv6 connections from their customers.  I don't know if the
timeframe is next year or 20 years from now,  but I do know the tech
companies are very good at looking at the costs of maintaining backwards
compatibility with old tech and figuring out ways to shed those costs when
they no longer make sense.  If they can utilize various forms of pressure
to make this happen quicker, I fully expect them to do so.

Inside a business network,  or even at home,  it wouldn't surprise me if
we're both long gone before IPv4 is eradicated.   I know there is going to
be a lot of IPv4 in my network for years to come just because of product
lifecycles.

As far as "CG-NAT-like" technologies go (meaning NAT in a provider's
network), they're unfortunately going to be with us for a long time since
customers seem to want to be able to reach everything regardless of the
IPv4 or IPv6 status of the customer or endpoint.   I also expect that most
service providers with business customers are going to be carrying both
IPv4 and IPv6 for a long time, not to mention doing a fair bit of
translation in both directions.

I won't go deeply into the whole IPv4 vs IPv6 discussion for a business
customer's "public address" because the topic is far too nuanced for an
email to cover them accurately.   Suffice it to say that I don't disagree
that business today largely wants IPv4, but some seem to be becoming aware
of what IPv6 can do and are looking to have both options available to them,
at least outside the firewall.

On Sat, Jan 13, 2024, 2:04 AM Brett O'Hara <brett () fj com au> wrote:

Ok you've triggered me on your point 2.  I'll address the elephant in the
room.

IPv4 is never ever going away.

Right now consumer services are mostly (mobile, wireless, landline, wide
generalization) are IPv6 capable.  Most consumer applications are ipv6
capable, Google, Facebook, etc.There is light at the very end of the tunnel
that suggests that one day we won't have to deploy CGNAT444 for our
consumers to get to content, we may only have to do NAT64 for them to get
to the remaining Ipv4 Internet.  We're still working hard on removing our
reliance on genuine ipv4 ranges to satisfy our customer needs, It's still a
long way off, but it's coming.

Here's the current problem.  Enterprise doesn't need ipv6 or want ipv6.
You might be able to get away with giving CGNAT to your consumers, but your
enterprise customer will not accept this. How will they terminate their
remote users?  How will they do B2B with out inbound NAT?  Yes, there are
solutions, but if you don't need to, why?  They pay good money, why can't
they have real ipv4?  All their internal networks are IPv4 rfc1918.  They
are happy with NAT.  Their application service providers are ipv4
only. Looking at the services I access for work things like SAP,
SerivceNow, Office386, Sharepoint, Okta, Dayforce, Xero, and I'm sure many
more, none can not be accessed on ipv6 alone..  Their internal network
lifecycle is 10+ years.  They have no interest in trying new things or
making new technology work without a solid financial reason and there is
none for them implementing ipv6.   And guess where all the IP addresses
we're getting back from our consumers are going?  Straight to our good
margin enterprise customers and their application service providers.
Consumer CGNAT isn't solving problems, it's creating more.

The end of IPv4 isn't nigh, it's just privileged only.

PS When you solve that problem in 50 years time, I'll be one of those old
fogey's keeping an IPv4 service alive as an example of "the old Internet"
for those young whippersnappers to be amazed by.

Regards,
   Brett



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