[Newbie] Info about ISP Gateways

Hi

I am new to this Pen-Testing idea, just finished the CEH course but that only showed how much I actually need to learn.

Problem number one:
I am on a Wireless/ADSL line, the ISP divided all the Wireless customer into separate "private" networks that then go through a gateway. To to vulnerability tests on customers on my same network from my office is a breeze, but to do it on the other networks will be a problem. Does that mean I need to "break" through the ISP's gateway first in order to reach the other "private" networks?

Problem number two:
Should I need to "break" through the gateway of the ISP to reach these customers then I guess the ISP might not be very happy about it, right? So what way is there around that?

Thanks
GJK


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