USB WiFi dongle connectivity issue

Hi everyone,

I’m able to connect my BBB to the router using an Edimax USB Dongle. The connection works fine and i can access Internet however i’ve noticed that it doesn’t work the other way around:

If i try to ping my BBB from another computer in the same network i get “Request timeouts”.
After some testing i noticed that if I ping the router ( from the BBB then the BBB can accessed from other computers in the same network for a short period of time (about 30s - 1min).

Any network experts out there? Is it something related to my router? or maybe the Linux distribution (Ubuntu and Debian tested) using in the BBB?