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Re: [v6ops] AWS ipv6-only features

Brian E Carpenter <brian.e.carpenter@gmail.com> Mon, 29 November 2021 21:43 UTC

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From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Date: Tue, 30 Nov 2021 10:43:24 +1300
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Subject: Re: [v6ops] AWS ipv6-only features
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On 29-Nov-21 20:08, Gert Doering wrote:
> Hi,
> 
> On Mon, Nov 29, 2021 at 03:15:52PM +0900, Lorenzo Colitti wrote:
>> With NPTv6, you can't tell a peer what address they can reach you at. So
>> applications like videoconferencing cannot work without a relay.
> 
> That ship has sailed long ago.
> 
> All this stuff works by registering some sort of identity at a central
> server, and that server will relay the session setup (and knows the
> member IPs).> 
> Nobody calls "an IP address".  So you need the registration/mapping service
> anyway.

Let's be even clearer. Discovery of peers and rendezvous with peers are
*required* functions for such services, regardless of IP version and
whether NAT or NPT is in use or not.

That doesn't mitigate the fact that NAT and NPT are very undesirable
things to have on your data path.

    Brian

> 
> (And to find the central server, a magic service called "DNS" was invented)
> 
> Gert Doering
>          -- NetMaster
>

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