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

[GangChen <[e-mail]>]

2013/7/18, Tore Anderson <[e-mail]>:
> * GangChen
>
>> Thanks for sharing your experience. Yes, you are right.
>> There is no such issue if the subscriber's traffic get back to the
>> gateway (e.g. GGSN) in the home network.
>> The described failure case occurred when the subscriber get an address
>> from the GGSN in the visited network. And traffic flows would be
>> transmitted in a local-breakout manner.  3GPP allows such
>> local-breakout because it has more efficient routing paths. 3GPP also
>> specified another architecture called "SIPTO". It guarantees the
>> subscriber would always select the closest GGSN to reside.
>
> I see. When roaming, I always get an IP address that belongs to my home
> provider (this goes both for IPv4 and IPv6), so I assume that it is the
> home network's choice whether or not to enable this "use closest GGSN"
> feature?

Yes, those behaviors could be gauged by subscriber's profile. For
example, disable local-break-out

> If so, I'd suggest adding some text that ensuring this feature is
> disabled (at least for the IPv6 PDP type, if it is possible to
> differentiate between the two) is a good way to prevent IPv6 subscribers
> from experiencing problems when roaming in IPv4-only networks.

Good suggestion. I would add the point in the next update.

Best Regards

Gang

> Tore
>