My ISP just sent me over a box ("modem") and now I am online. I am afraid of beeing exposed directly to the internet.
How do I check to which level my machine is accessible from the internet?
closed as off-topic by Al E., pnuts, Eight Days of Malaise, Alex, John C Jan 30 '15 at 7:48
This question appears to be off-topic. The users who voted to close gave this specific reason: