From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?utf-8?Q?Bj=C3=B8rn_Mork?= Subject: Re: [PATCH] net: qmi_wwan: MC73xx interface 10 is not QMI Date: Tue, 10 Feb 2015 12:39:32 +0100 Message-ID: <87h9uuatcb.fsf@nemi.mork.no> References: <8761bbqker.fsf@nemi.mork.no> <20150209.141947.1972128292278697717.davem@redhat.com> <874mqucije.fsf@nemi.mork.no> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Aleksander Morgado , David Miller , "netdev\@vger.kernel.org" To: Kristian Evensen Return-path: Received: from canardo.mork.no ([148.122.252.1]:39780 "EHLO canardo.mork.no" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750885AbbBJLjy convert rfc822-to-8bit (ORCPT ); Tue, 10 Feb 2015 06:39:54 -0500 In-Reply-To: (Kristian Evensen's message of "Tue, 10 Feb 2015 11:53:03 +0100") Sender: netdev-owner@vger.kernel.org List-ID: Kristian Evensen writes: > On Tue, Feb 10, 2015 at 11:37 AM, Aleksander Morgado > 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 APN= s > for IPv4 and IPv6. Sure, very useful for testing, although I don't think that they meant i= t that way. I believe the assumption is that you get full Internet acces= s 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 independen= t 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(!) Bj=C3=B8rn