Re: [v6ops] A common problem with SLAAC in "renumbering" scenarios

Fernando Gont <fgont@si6networks.com> Thu, 21 February 2019 01:35 UTC

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To: Lorenzo Colitti <lorenzo=40google.com@dmarc.ietf.org>, "Manfredi (US), Albert E" <albert.e.manfredi@boeing.com>
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From: Fernando Gont <fgont@si6networks.com>
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Date: Wed, 20 Feb 2019 22:13:28 -0300
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Subject: Re: [v6ops] A common problem with SLAAC in "renumbering" scenarios
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On 20/2/19 20:43, Lorenzo Colitti wrote:
> On Thu, Feb 21, 2019 at 7:17 AM Manfredi (US), Albert E
> <albert.e..manfredi@boeing.com <mailto:albert.e.manfredi@boeing.com>> wrote:
> 
>     Right. So, why shouldn't this NAT66 idea be taken more seriously?
>     All of the advantages of the basic NAT come to bear, including the
>     renumbering problem in enterprises, including no changes required to
>     SLAAC timers, and sessions easily survive a reboot of the edge
>     router, and yet none of the port translation kludge that made NATs
>     useful in IPv4.
> 
> 
> Because the advantages are for network operators have corresponding
> disadvantages for application developers and thus for users. Application
> complexity and brittleness due to NAT traversal. Battery impact of NAT
> keepalives. Higher-latency due to relaying and rendezvous. And so on.

Given that RFC6092 recommends "only allow outgoing connections", and
that many IPv6 CPEs fail to implement UPnP for IPv6, I'm wondering that
what extent what you mention is actually true. (yes, we'd wish that was
the case... unfortunately, in many cases it isn't)

-- 
Fernando Gont
SI6 Networks
e-mail: fgont@si6networks.com
PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492