Re: Does NetworkManager support blocking non-home networks (UMTS/3g)

[Marcel Holtmann <marcel holtmann org>]

Hi Dan,

> > I can't seem to find it in the GUI or in the documentation.
> > 
> > Can NetworkManager be configured to only connect to home networks? Say I 
> > am on Vodafone and get free data usage, but then move to an area with 
> > poor signal for Vodafone, can I prevent switching to T-Mobile which 
> > costs me money?
> > 
> > If yes, can this be determined automatically, or is this done with a 
> > string match?
> 
> For cards where we actually know the commands for controlling roaming,
> yes we can do this, otherwise NM will need to send the specific MCC/MNC
> of your operator to the modem, which has its own problems.  This is
> definitely going to be fixed in the near future, but there's no facility
> for doing so now other than entering the MCC/MNC of your operator into
> teh Network entry in the connection editor.

what do you mean by this. It makes no sense. Which card can be
controlled to roam or not via its firmware. Normally this is all host
stack stuff.

You get the current MCC/MNC from the network notifications and your home
network is part of the IMSI. Only trick part with the IMSI is that you
have to check first if the MNC is two or three digits long. That value
is stored somewhere in the SIM card.

The network notifications also tell you if you are roaming not. So in
case you go over to roaming and don't wanna allow it, you have to
disconnect the GPRS connection at that point.

Regards

Marcel