Computer Nerd Kev  wrote:
> 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.
>
Yes, absolutely, trying to find the *actual* way they charge is very
often well nigh impossible and they usually don't know themselves (or
at least the people you talk to don't know).

--
Chris Green
·

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