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Re: [v6ops] draft-palet-v6ops-464xlat-opt-cdn-caches **Call for Adoption**

Ca By <cb.list6@gmail.com> Thu, 09 January 2020 19:04 UTC

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From: Ca By <cb.list6@gmail.com>
Date: Thu, 09 Jan 2020 11:03:49 -0800
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Cc: Lencse Gábor <lencse@hit.bme.hu>, v6ops@ietf.org
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Subject: Re: [v6ops] draft-palet-v6ops-464xlat-opt-cdn-caches **Call for Adoption**
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On Thu, Jan 9, 2020 at 9:41 AM <otroan@employees.org> wrote:

> >    Stateful technologies, 464XLAT and DS-Lite (and also NAT444) can
> >    therefore be much more efficient in terms of port allocation and thus
> >    public IP address saving.  The price is the stateful operation in the
> >    service provider network, which allegedly does not scale up well.  It
> >    should be noticed that in many cases, all those factors may depend on
> >    how it is actually implemented.
> >
>
> Not allegedly.
> The two mechanism-types do have different scaling properties.
> The CGN type are pets (scale with sharding + HA mechanisms), the stateless
> mechanisms behave like cattle. I.e. you just add more instances.
>
> Cheers,
> Ole


eh, i don’t believe there is a meaningful scaling function difference.  I
don’t know the details of how MAP works, the domains and dhcp dependencies
always seemed like a Rube Goldberg machine,  but for 464xlat, if you think
of DNS64 being an anycast and / or PREF64 as anycast... you just add more
to scale horizontally.  Yes, each NAT64 needs a unique ipv4 pool, but it’s
not an artisanal craft.

A stateful NAT44 / NAT64 can also scale beyond 65k sessions / ports per
ipv4 using a full 5-tuple... so if we are talking about pushing ipv4
efficiency, this cannot be beat.



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