[Gllug] Oddity using Three USB modem under Linux

[John Winters]

I've just got one of those Three USB modems (Huawei E220) and am 
experimenting with it under Linux.  I've managed to connect without too 
much difficulty (although the process still needs smoothing out a bit) 
but I've noticed something odd.

If I plug the modem into a Windows box and connect using their supplied 
software then my interface gets a real IP address.  For instance, just 
now it got 92.40.61.115.

If however I connect using Gnome-PPP from Linux (using the settings 
gleaned from their MacOS X instructions) I get a private IP address. 
The last time I tried I got 10.119.64.160.

Both work, but clearly there is a significant difference between the two.

Anyone any idea why the difference, and what I might do to get a real IP 
address when connecting from Linux?

TIA,
John
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