The Natural Philosopher  wrote:
> On 27/12/2020 14:49, Andy Burns wrote:
> > Chris Green wrote:
> >
> >> So does just trying to connect *to* the device which has the data sim
> >> dongle wake up the connection?
> >
> > A *little* bit more than that, a lot of 4G dongles still pretend to be
> > modems, using e.g. ATDT*99# command to "dial" the connection, no
> > dialling takes place, but it's a convenient lie to allow a PPP daemon to
> > bring up the 4G connection and get an IP addr etc.
> >
> >> It means one needs a dynamic DNS
> >> service but that's not a big problem.
> >
> > That'll work, provided your mobile provider gives you a public IP
> > address, not a private one that's NATed.
> thats a very very big IF.
>
> I run a few public websites and trawl through the logs have happened
> when they have been DOSed
>
> All IP ranges from mobile devices have been NATed. It is extremely rare
> to find *anyone* actually not behind a NAT router - some big companies.
>
> Obviously if YOU control the NAT router not the mobile ISP, and THAT has
> a fixed IP address you can set up an inbound connection but not many
> people do.
>
OP here. Yes, I get through a NAT router firewall already when
connecting via the (unreliable) marina WiFi by using ssh tunnelling.

The Pi (well BBB actually) makes an ssh connection out to an
intermediate system where I have an ssh login account and sets up
reverse tunnels to allow ssh from the 'outside' back into the BBB. It
works well apart from the marina WiFi disappearing at intervals.

--
Chris Green
·

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