Re: [v6ops] I-D Action: draft-ietf-v6ops-ipv6-roaming-analysis-02.txt

[Tore Anderson <[e-mail]>]

* Vízdal Aleš

> The APN settings set at the UE (handset) are telling the UE
> what to 'request' from the mobile network (e.g. APN name to
> connect to, PDP type ipv4 or ipv6 or ipv4v6...). The mobile
> network is than comparing what was 'requested' by the UE/subscriber
> with subscriber's profile at the HLR/HSS. I can be that the
> network will allow both IPv4/IPv6, but the UE will be configured
> to request IPv6 at home and IPv4 while roaming, so it won't break.
> 
> Some UEs such as Android since some version I cannot recall
> offer to specify the Home network PDP Type to control what
> will the UE request while at the Home network and a dedicated
> PDP Type setting for roaming, so that a different PDP Type
> can be used if necessary.

Yes, I think I've understood this part. My point is that since Telenor's
APN does not support the IPv4 PDP type, then it won't work to use IPv4
as the Roaming PDP type, as was suggested earlier in the thread. (Nor as
the Home PDP type, for that matter.) So the only sensible setting in
this case would be to use PDP type IPv6 for both the Roaming and Home
PDP type settings.

If on the other hand the APN supports both IPv4 and IPv6 (like
Tele2/NwN's does), then that is a different story, and having the UE use
IPv4 when roaming makes sense (if the roaming partners break IPv6 for
some reason).

At least that's how I understand it...

Tore