D-Link Air DWL-900AP User Manual page 53

Networking Basics
Checking the Connection by Pinging (continued)
For example, you can type "ping 192.168.0.10," if that is the IP address of
the DWL-900AP in this case, and hit the "Enter" key.
A successful ping will show four replies. The IP Address shown is only an
example, your IP Address may be different.
Type Exit at the prompt to close the screen.