I'm under the impression that 3G broadband over Bluetooth can be done
over:
- PAN Bluetooth protocol
- DUN Bluetooth protocol
- RFCOMM Bluetooth protocol
PAN does not use PPP. Rather, you activate the PAN link, and that gives
you a packet network, like ethernet. Then you can use DHCP etc. and it
generally works to give you an internet connection, although sometimes a
reduced MTU is required - not always reported correctly over DHCP.
Some phones support more than one of these. I didn't see any options in
NetworkManager's Edit Connections window to choose which of the
Bluetooth protocols to use.
When I did fill in some dialup settings (for the 3 network in the UK),
they looked fine, but I didn't find anywhere to activate the connection
having added it! The GUI looked to me like right-clicking on a
connection ought to enable/disable it or something, but no such
behaviour. The connection did not appear in the main NM list - only my
wireless APs, and (bizarrely) "ifupdown (tap0)" (+tap1, tap2) under
wired.
It's only on reading this bug report that (doh!) I realise "mobile
broadband" doesn't mean mobile broadband the way I've been used to it -
it means only via a built-in or USB 3G modem, doesn't it?
RFCOMM should be really easy to support. It's simply dialup with PPP,
except you use /dev/rfcomm0 as the serial port. It's possible that it
can take up a channel of the phone's mobile link, preventing web
browsing and other data access on the phone itself. PAN seems better in
this respect.
On Hardy, I tested Bluetooth RFCOMM and USB ACM for broadband, and found
Bluetooth slightly slower but it seemed to use less power than USB, so I've
used Bluetooth on Hardy ever since.
When I got a new phone, I switched to Bluetooth PAN.
On Hardy I had to kill NM to use 3g broadband. On Intrepid, I was
excited to see the "mobile broadband" under Edit Connections, and
disappointed to find this doesn't mean via Bluetooth, which surely is
the most common way of doing it with a mobile phone? I'm hoping I'll be
able to use PAN the same way as I did in Hardy, but haven't had success
yet.
--
[MASTER] NM 0.7 lacks bluetooth 3g support
https://bugs.launchpad.net/bugs/269329
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