Re: [v6ops] new draft: draft-chen-v6ops-ipv6-roaming-analysis

Hi Cameron,

Could you please share more details about 3a and 3b below?

WOuldn't the UE fallback to v4 PDP, if v4v6 PDP wasn't available?

Cheers,
Rajiv

-----Original Message-----
From: Cameron Byrne <cb.list6@gmail.com>
Date: Sunday, July 28, 2013 11:48 AM
To: "Fred Baker (fred)" <fred@cisco.com>
Cc: "v6ops@ietf.org" <v6ops@ietf.org>,
"draft-chen-v6ops-ipv6-roaming-analysis@tools.ietf.org"
<draft-chen-v6ops-ipv6-roaming-analysis@tools.ietf.org>
Subject: Re: [v6ops] new draft: draft-chen-v6ops-ipv6-roaming-analysis

>As general feedback
>
>1. As others have noted, it is important to clarify that home routed
>is the default case and local-breakout is only relavent for IMS, but
>IMS based roaming and local breakout is yet to see its first
>deployment, and may still be years in the future for roaming to work
>this way.  So, local breakout is not  a real case and seems to be
>causing more confusion.
>
>2.  There is a hazard in assuming the well known prefix is always
>available.  Any device should not assume the well known prefix is
>available.  This is essentially a misconfiguration that should not
>occur.
>
>3.  What i have learned
>
>a.  dual-stack 2 PDP will never work, charging issues in the billing
>system, and too much capacity wasted for no real gain
>
>b.  dual-stack 1 PDP (v4v6) will not work any time soon.  Enabling
>this feature in the HSS/HLR breaks roaming and there is no way to
>ensure this issue is fixed in the hundreds of networks that are
>potentially impacted.  There are some backs to do on the home network
>that can make this easier but not exposing partner networks to the new
>release 8 features.
>
>c.  What does work and adds value (saves IPv4 address for the common
>case of not-roaming) :  IPv6-only single PDP 464XLAT on the home
>network, IPv4-only single PDP when roaming.  This is how i am moving
>forward.  The when at home, the UE has default configs for ipv6-only
>and when roaming the ue only attempts to connect using IPv4.  This
>gets the vast majority of users in my home network off v4 and keeps
>ipv4 for the complicated yet relatively small percentage of roaming
>users.
>
>
>
>On Tue, Jul 9, 2013 at 5:45 AM,  <fred@cisco.com> wrote:
>>
>> A new draft has been posted, at
>>http://tools.ietf.org/html/draft-chen-v6ops-ipv6-roaming-analysis.
>>Please take a look at it and comment.
>> _______________________________________________
>> v6ops mailing list
>> v6ops@ietf.org
>> https://www.ietf.org/mailman/listinfo/v6ops
>_______________________________________________
>v6ops mailing list
>v6ops@ietf.org
>https://www.ietf.org/mailman/listinfo/v6ops