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.

--
Chris Green
·

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