Point to Point interface over qmi_wwan device

[Dan Williams]

On Tue, 2016-10-04 at 16:28 +0000, Tang Nguyen wrote:
> Hi all,
> I have tested /32 mask on wwan without running dhclient. but seems
> not working .  The  packet connection successfully connected but it
> would be dropped after a while.  Looks like Sierra firmware waits for
> dhclient discovery request from host, and after a while it would
> disconnect the data link.
> My module is MC7354 (ATT)
> What I did as below:
> 1. start network connection.  Verify connection status with command:
> qmicli  -d /dev/cdc-wdm3 --wds-get-packet-service-status2. Send AT
> command to modem to show assigned IP address3. Using ip command to 

Why use the AT command?  Why not:

qmicli -d /dev/cdc-wdm3 --wds-get-current-settings --client-no-release-
cid --client-cid=<cid from start network>

I seem to recall we've had devices before that didn't fully set up the
WAN interface until they got asked for the IP details, and I wouldn't
necessarily trust the AT interpreter to do the same thing.  But the QMI
GetCurrentSettings request might.

Dan

> set ip address from step #2 for wwan interface4. Set default route to
> wwan interface5.  Ping outside faild with error: "Destination Host
> Unreachable"
> Other running PPPd over serial USB port, is there any way we can
> force cellular interface to be a point-to-point interface ?
> ThanksTang 
> 
>     On Saturday, October 1, 2016 1:11 PM, Tang Nguyen <tang_nguyen at ya
> hoo.com> wrote:
>  
> 
>  Thank you Bjorn.  I will try to set it as your suggestion to see how
> it works.
> 
> Our customer designs their network running out box as one of
> gateway.  They don't want to advertise their network behind the box,
> so they require cellular link as a point to point interface- not
> sending broadcast.  It works well evdo modem, which is a PPP link
> over cellular network.
> Thanks again Bjone.
> 
> Tang
> 
> Sent from my iPhone
> 
> > 
> > On Oct 1, 2016, at 12:39 PM, Bjørn Mork <bjorn at mork.no> wrote:
> > 
> > Tang Nguyen <tang_nguyen at yahoo.com> writes:
> > 
> > > 
> > > Hi,
> > > I am working on the feature of setting a netmask of /32 for  wwan
> > > network interface.  Usually, dhclient would get a /29 netmask 
> > > from mini dhcpserver in modem.  The wwanX ethernet-line interface
> > > and /29 netmask has affected to OSPF network design over LTE
> > > modem.  We need to have a Point-to-Point interface and /32
> > > netmask on wwan to solve this problem. 
> > > I can open a PPP pver serial ttyUSB serial oport, but doing that
> > > we loose the AT command port and too much PPP overhead. 
> > > Can we have anyway to force wwanX to have  /32 netmask  over
> > > libqmi - I intend to use "ip or ifconfig" command to change
> > > netmask of wwan, but not sure it is the right way or not.  
> > 
> > Setting a /32 mask manually should not be a problem as long as you
> > don't
> > use DHCP.  You'll just have to configure routing manually too.  But
> > since you are running OSPF, I guess that's not a problem.
> > 
> > I must admit I'm a bit curious about the OSPF part. Don't think it
> > is
> > very common to run routing protocols over LTE links.  But I cannot
> > think
> > of any reason why it shouldn't work. IS-IS won't work, though :)
> > 
> > 
> > Bjørn
> > 
> > _______________________________________________
> > libqmi-devel mailing list
> > libqmi-devel at lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/libqmi-devel
> 
>    
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