Chris Green  wrote:
> Theo  wrote:
>> Chris Green  wrote:
>> > OK, my current WiFi set up is (as a mobile connection would be) behind
>> > a NAT router and I set up reverse ssh tunnels to allow me to connect
>> > 'on demand' to the Pi (BBB).  So I can do exactly the same using the
>> > mobile data connection.
>> >
>> > Will the mobile provider object to the connection being up all the
>> > time but with virtually no data going through it?
>>
>> Mobile networks are often quite aggressive at killing idle connections
>> through their CG-NAT - 30 seconds idle is common, for example.  To avoid
>> that you have to send keepalives, which will gradually consume your data
>> allowance.
>>
> But a keepalive is only a character (or two), even if it sends a TCP
> packet as a result that's 1500 bytes.  Say 600 keepalives per Mb,
> that's only a few Mb per day which shouldn't cost too much.

This depends on the provider. I've been using mobile broadband for
my home internet for years, from various providers. At least one
rounded up the data used over certain connection periods for
charging purposes. Maybe you'll avoid that if the connection never
does go dead, but on the other hand it might trigger regular
round-ups to 1MB just because an open connection gets rounded up
to 1MB every so often by their system.

This is a "try it and see" sort of thing, terms of service
documents can be long and detailed, but often don't actually match
the reality of how their system works. Some providers round up by
KB instead of MB, by the way.

This is based on experience with mobile broadband providers in
Australia only.

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