Apple MacBook Pro (13-inch, Mid 2009) - Manual (Page 58)

58 Chapter 4 Problem, Meet Solution
Network Connections
Make sure the Ethernet cable is connected to your MacBook Pro and to the network.
Check the cables and power supplies to your Ethernet hubs and routers.
If you have two or more computers sharing an Internet connection, be sure that your
network is set up properly. You need to know if your ISP provides only one IP address
or if it provides multiple IP addresses, one for each computer.
If only one IP address is provided, then you must have a router capable of sharing the
connection, also known as network address translation (NAT) or “IP masquerading.”
For setup information, check the documentation provided with your router or ask the
person who set up your network. You can use an AirPort Base Station to share one
IP address among multiple computers. For information about using an AirPort Base
Station, check Mac Help or go to the Apple AirPort website at
www.apple.com/support/airport.
If you cannot resolve the issue using these steps, contact your ISP or network
administrator.
Problems with AirPort Extreme Wireless Communication
If you have trouble using AirPort Extreme wireless communication:
 Make sure the computer or network you are trying to connect to is running and has a
wireless access point.
 Make sure you have properly configured the software according to the instructions
that came with your base station or access point.