(Bjorn?) Re: Trying to get MC7354 connected to Verizon data network

[Bjørn Mork]

Dan Williams <dcbw at redhat.com> writes:

> On Mon, 2016-01-18 at 15:15 -0600, Glenn Washburn wrote:
>> Hi All,
>> 
>> I've had a ton of headaches getting my MC7354 on Verizon's M2M data
>> network.  Using NM+MM I can get the interface to come up with an IP,
>> so
>> it seems as though I'm connected to verizon's network.  However, when
>> I
>> run "curl -v --interface wwan0 http://www.google.com", I get connect
>> failures.
>> 
>> I've attached a tcpdump on the wwan0 interface, which suggests that
>> google is getting the tcp syn and responding with a syn+ack as
>> expected.  However, the tcp syn get resent, as if somewhere up the
>> stack the syn+ack gets lost.  I've turned off iptables, so nothing is
>> getting filtered there.
>> 
>> Has any one any clues as to what might be going on?
>> 
>
> Bjorn, I worked with Glenn for a while on IRC last week and ran out of
> ideas.  Any thoughts here?

Not really. I took a look at the dump only to see what Glenn describes
above. The connection is active and "working", at least from a NM+MM
point of view. I cannot see any other way you can possibly receive that
synack. But I have no idea why it stops there. Must be a packet filter
in place somewhere, I guess. But why?  Is there some extra activation
step necessary to enable the use of this APN?  Is there some other
account setting which could make Verizon turn on a filter here?

Just some wild guesses...


Bjørn