Reg: IPv6 on MC7354

Balaji Sivakumar shivbalaji1985 at
Sat Feb 11 13:48:56 UTC 2017

Thanks Bjorn for the details, Have tried the option you have mentioned and
thats when am getting POlicy mismatch error. I have to try the ModemManager
to verify it.

On Wed, Feb 8, 2017 at 2:57 AM, Bjørn Mork <bjorn at> wrote:

> Balaji Sivakumar <shivbalaji1985 at> writes:
> > Thanks Bjorn for the reply, I got the idea and it works for me well.
> >
> > Do you have any suggestions/ idea on creating dual stack connections on
> > single /dev/cdc-wdm device ? we are getting 'Policy Mismatch error'.
> I wonder if that is caused by trying to "convert" a single stack
> connection to dual stack?
> QMI is (or was?  this might be fixed in newer versions?) weird wrt dual
> stack.  There is no way to request an IPV4V6 context when connecting,
> since you can only specify a single family per connection request.  But
> only the first connection request will actually create a network
> context.  The second one, for the second family, will simply return the
> family specific data from the existing dual-stack connection.  Or fail,
> if that connection is single stack.
> One way to make the first connection dual stack is to predefine a dual
> stack profile matching the APN.  I don't think this is supported in
> qmicli yet, but you can use AT commands to do it:
>  at+cgdcont=1,"IPV4V6", "yourapn"
> You should check your list of configured profiles first, to make sure
> you don't mess up a profile you want to keep and also make sure you
> don't have any other (single family) profile for the same APN. If you
> have then that might be selected instead and you end up with a single
> family connection.
> Then issue the two family specific connection requests referring to this
> apn:
>  qmicli -d /dev/cdc-wdm0 --client-no-release-cid --wds-start-network=apn=
> yourapn,ip-type=4
>  qmicli -d /dev/cdc-wdm0 --client-no-release-cid --wds-start-network=apn=
> yourapn,ip-type=6
> Don't know if this was what you already tried.  It's been a long time
> since I did anything like this manually.  ModemManager tends to DTRT
> nowadays, so I just lean on that.  If you are still having problems then
> you should study what ModemManager does to initiate a dual stack
> connection.
> Bjørn
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