Re: draft-arkko-ipv6-transition-guidelines WGLC

[Cameron Byrne <cb.list6@gmail.com>]

On Fri, Aug 20, 2010 at 12:50 PM, Mikael Abrahamsson <swmike@swm.pp.se> wrote:
> On Fri, 20 Aug 2010, Cameron Byrne wrote:
>
>> And, as i have pointed out before in various forums, today's 3G networks
>> require 2x the signalling and packet core cost for dual stack users (2x
>> bearers, 2x mobility events, 2x many things ...).  Yes, the costs change in
>> LTE .... LTE will not be mainstream before IPv4 Exhaust.
>
> I would like to question the 2x cost.
>
> Yes, multi-bearer per user license cost money, so does handling 2x numbers
> of bearer, but the number of packets isn't going to be 2x so actual packet
> moving hw won't be even close to 2x cost. More license, more
> HLR/MME/SPGW/GGSN/SGSN signalling, but not more packets.

Agreed.  The 2x cost is really just the packet core ... which is of
course a lot of money to double for no tangible benefit ..... talk
about no business case .... And, still have numbering issues, customer
experience is the same as IPv4-only + NAT44 and approximately the same
as IPv6-only + NAT64

>
> I also don't really see how LTE changes things dramatically in this aspect,
> to enable roaming we're going to be stuck at GTPv1 bearers for the
> forseeable future (IMHO), so we're still going to have to do 2x PDP context
> for users with IPv4 and IPv6 dual stack.
>

If you do dual-stack services, yes.  The model i am driving for is
IPv6-only when in-network and IPv4-only when roaming.  I believe this
is the practical approach given that billing for IPv6 roaming will be
very slow.

> It might even be that ds.lite with ipv6 only to the phone makes more sense
> here because I'd imagine that enables roaming with single PDP context/bearer
> instead of multiple, and I'd imagine the roaming network doesn't really care
> if the user has IPv4 or IPv6? I'm not a roaming expert though, might be
> wrong.
>

IMHO, i don't see a good fit for DSlite on traditional mobile
handsets, and that i believe was the conclusion of the 3GPP-IETF
meeting in San Fran.  Perhap there is a good fit for DSlite + mobile
hotspots (MiFi).

> --
> Mikael Abrahamsson    email: swmike@swm.pp.se
>