On Mon, 2014-12-22 at 21:46 +0100, Aleksander Morgado wrote: > >>>> Are you suggesting that by default NM should try with IPv4 or IPv6 PDP > >>>> context types if both are enabled and IPV4V6 fails? > >>> > >>> Yes, I think that would be the best solution. > >>> > >>>> In QMI modems it is ModemManager the one connecting separately IPv4 > >>>> and IPv6 WDS sessions when IPv4v6 is requested. > >>> > >>> Yep, when that's possible that's even better. My Nokia 21M-02 does > >>> pretty much the same in the firmware. But I'm not so sure if we can > >>> rely on such functionality always being possible? > >>> > >> > >> MBIM allows to request IPv4v6 or separate IPv4 and IPv6; currently we > >> try one or the other, because the ModemManager API allows asking for > >> both cases. The fact that in QMI we default to separate IPv4 and IPv6 > >> is because we can do so using different WDS clients on the same > >> control port, but maybe we shouldn't, and instead just expose we > >> support separate IPv4 and IPv6? > > > > Nope. As discussed recently, we need to be aware of the distintion > > between IPV4, IPV6 and IPV4V6 on QMI modems as well. Your first QMI > > WDS start network command will select one of these types. The second > > start network command can only succeed if the selected type was IPV4V6. > > > > On the other hand, as Tore points out, there might be situations where > > you want to select IPV4 or IPV6 explicitly, even if the modem appears to > > support IPV4V6. > > > > So you need the full context type choice for QMI as well. The odd > > two-step dual-stack connection does not change this. The PDP type is > > always selected by the first connection. > > Is that true even if we use different separate WDS clients? If either > IPv4v6 and IPv4+IPv6 are selected for a QMI modem, MM's logic will > create separate WDS clients, each of them with a different "Set IP > Family Preference" set before calling "Start Network". Are we > achieving something correct with this logic? Or not? And if not, how > are we supposed to request IPv4v6 using only QMI? (i.e. not with the > default profile being configured via AT commands).
I verified a while back that this is what Verizon's connection manager did on Windows with the UML290 to achieve a working dual-stack connection. And yes, all 3 PDP contexts in the modem were "IPV4V6". AFAIK there is no way to get a dual-stack connection without starting two WDS clients and setting the IP Family Preference. Dan _______________________________________________ networkmanager-list mailing list networkmanager-list@gnome.org https://mail.gnome.org/mailman/listinfo/networkmanager-list
