Subj : Pvt node with a CM flag, but without connect info.
To   : Kees van Eeten
From : Michiel van der Vlist
Date : Sun Jun 09 2019 18:15:21

Hello Kees,

On Sunday June 09 2019 17:09, you wrote to me:

 KE> I do not know what transport GSM uses, But could not the GSM transport
 KE> be the Tunnel and carry a vlan to your endpoint.

I am clueless...

 KE> A quick search shows that GSM is related to SS7. There is no IP in
 KE> SS7. So you probably get a IP over XXXXX like with ADSL. It is still
 KE> all Telecom world thinking.

GSM is part of the link layer. Like ISDN. When I used it for data many moons ago, I called a telephone number for Internet access, just like one did with a POTS modem. It was the same number in fact. It was my understanding that there were modem banks in the GSM exchange of the provider.

 KE> When you are roaming you certainly do not get IP access in the country
 KE> where you are. You access the net trough the entry point of your
 KE> provider.

If you say so. I am out of my leage here...

 KE>  I currently have no active forein Sim cards, so I cannot support my
 KE>  remarks with real results.

You can check next time when you venture outside The Netherlands. I will do the same when I get a chance.


Cheers, Michiel

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