Is the Internet not working for you?  This is how you can help diagnose.

Mac/Linux

Open up Terminal and run the following commands, and send the output to internet@hackerdojo.com:

ifconfig

ping -c 4 8.8.8.8

ping -c 4 10.15.0.1

host www.google.com

netstat -r

Windows

Open up Command Prompt (Start -> Run -> type "cmd" and hit enter) and run the following commands, and send the output to internet@hackerdojo.com:  

ipconfig

ping 8.8.8.8

ping 10.15.0.1

nslookup www.google.com

route print