netdev - Re: [PATCH] net: qmi_wwan: MC73xx interface 10 is not QMI

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Message-ID: <87h9uuatcb.fsf@nemi.mork.no>
Date:	Tue, 10 Feb 2015 12:39:32 +0100
From:	Bjørn Mork <bjorn@...k.no>
To:	Kristian Evensen <kristian.evensen@...il.com>
Cc:	Aleksander Morgado <aleksander@...ksander.es>,
	David Miller <davem@...hat.com>,
	"netdev\@vger.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH] net: qmi_wwan: MC73xx interface 10 is not QMI

Kristian Evensen <kristian.evensen@...il.com> writes:
> On Tue, Feb 10, 2015 at 11:37 AM, Aleksander Morgado
> <aleksander@...ksander.es> wrote:
>> With ModemManager you can use both WWAN interfaces by creating
>> independent Bearer objects and getting them connected independently
>> (e.g. to different APNs). Not sure if anyone will ever do that, but
>> well.
>
> Thanks for reminding me of this use case. One scenario where it makes
> sense is how IPv4/IPv6 is handled by some mobile broadband operators.
> I know of at least one Norwegian ISP that at least used different APNs
> for IPv4 and IPv6.

Sure, very useful for testing, although I don't think that they meant it
that way.  I believe the assumption is that you get full Internet access
using either APN, with DNS64/NAT64/464XLAT for the IPv6 only one.

Other use cases I can think of:
 - dedicated MMS APN
 - dedicated voice APN
 - VPN APN(s)

all in combination with an Internet access APN.  So yes, two independent
bearers are certainly useful.  I expect many modems will support more
than one bearer in the near future.  The Intel XMM7160 based modems,
like for example the Sierra Wireless EM7345, already support 8(!)


Bjørn
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