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Re: [v6ops] Eric Rescorla's No Objection on draft-ietf-v6ops-rfc6555bis-05: (with COMMENT)

Lorenzo Colitti <lorenzo@google.com> Sat, 21 October 2017 03:29 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Sat, 21 Oct 2017 12:28:57 +0900
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To: Eric Rescorla <ekr@rtfm.com>
Cc: Cameron Byrne <cb.list6@gmail.com>, "v6ops@ietf.org WG" <v6ops@ietf.org>, v6ops-chairs@ietf.org, The IESG <iesg@ietf.org>, draft-ietf-v6ops-rfc6555bis@ietf.org
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Subject: Re: [v6ops] Eric Rescorla's No Objection on draft-ietf-v6ops-rfc6555bis-05: (with COMMENT)
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On Oct 21, 2017 08:17, "Eric Rescorla" <ekr@rtfm.com> wrote:

But we also like ipv6 better than Ipv4 because it is cheaper.
>
> From a mobile network operator perspective, ipv4 NAT paths are
> dramatically more expensive (cost creating and maintaining session state in
> hw on the CGN, complex large scale stateful software , ALG bugs, buying
> public IPv4 address to feed the CGN ...., per transaction or per port block
> in time logging for LEA, secure storage of said logs, ... ).
>

That's reasonable, I suppose, but (a) not everyone is on mobile and (b) the
endpoint's interests may not align with yours.


Those factors are in no way specific to mobile networks.
IPv4 addresses and NATs cost money for everyone. Stateless translation
doesn't use NAT, but because it's stateless, port space has to be assigned
in advance, so it consumes more IPv4 space than stateful translation.
Public IPv4 to users is already infeasible for new entrants, and will be
infeasible in the sort to medium term incumbents.

I don't see any cheaper alternative than IPv6. Do you?

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