IPv6 with simple-connect

[Dan Williams]

On Thu, 2013-09-05 at 15:19 +0200, Bjørn Mork wrote:
> Aleksander Morgado <aleksander at lanedo.com> writes:
> 
> > On 05/09/13 09:52, Martin Anderseck wrote:
> >> I'm using the Sierra Wireless MC7710 module with IPv4 and IPv6. When I 
> >> want to setup an IPv4 connection I use
> >> mmcli -m 0 --simple-connect="apn=myIPv4APN,ip-type=ipv4"
> >> and it works fine.
> >> However if I want to setup an IPv6 connection I'd normally use
> >> mmcli -m 0 --simple-connect="apn=myIPv6APN,ip-type=ipv6"
> >> This always leads to 
> >> error: couldn't connect the modem: 
> >> 'GDBus.Error:org.freedesktop.libqmi.Error.Protocol.CallFailed: QMI 
> >> protocol error (14): 'CallFailed''
> >> 
> >> If I have set the PDP context before using the AT commands
> >> at+cgdcont=1,"IPV6","myIPv6APN"
> >> then it works. This step is not necessary for IPv4 connections. 
> >> 
> >> If I have deleted all PDP contexts before starting the simple-connect 
> >> command a new very general IPv4 entry is generated in both cases:
> >> +CGDCONT: 1,"IP","","0.0.0.0",0,0
> >> 
> >> Is this a bug in ModemManager or do you think it's a firmware issue?
> >
> > The QMI implementation performs several steps to setup the IP type to
> > use. Could you share a debug log of MM while trying to establish a IPv6
> > connection?
> >
> > Bjorn and/or Dan may know more on this, as I haven't played much with
> > IPv6 myself.
> 
> Nor have I, I'm afraid.  My IPv6 enabled SIM stopped working a long time
> ago and I haven't bothered nagging anyone about it.  But I dug up the
> commands I were using when I had it working, and compared them to what
> you do in libqmi + MM now.  Looks very similar to me. But then again you
> probably got the (barely tested) procedure from me in the first place...
> 
> It's very likely that I never tested the case where there was no
> predefined context.  Hmm, looking at this now, there does not seem to be
> anything choosing between a IPV6 or IPV4V6 PDP type unless you have a
> matching predefined context. And we do really need to choose one of
> those, don't we?  But the PDP type isn't part of the "start network"
> command, is it?  Just indirectly by reference to a profile.  So maybe we
> need to look through QMI_WDS_GET_PROFILE_LIST, possibly using
> QMI_WDS_CREATE_PROFILE to make sure there is a profile with the
> appropriate PDP type?

Yeah, that sounds plausible.  I haven't looked too closely at the
profile list in my QMI IPv6 capable devices, but I'm pretty sure most of
them already had an IPv6-capable PDP context defined via AT commands or
they came preconfigured.

Dan