Point to Point interface over qmi_wwan device

[Tang Nguyen]

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
> 
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