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December 2004
vi Contents
Erasing the Configuration .........................................................................................5-3
Upgrading the Wireless Router Software .......................................................................5-3
Chapter 6
Troubleshooting Common Problems
Basic Functioning ...........................................................................................................6-1
Power Light Not On ..................................................................................................6-1
Lights Never Turn Off ...............................................................................................6-2
LAN or Internet (WAN) Port Lights Not On ...............................................................6-2
Troubleshooting the Web Configuration Interface ..........................................................6-2
Troubleshooting the ISP Connection ..............................................................................6-3
Troubleshooting a TCP/IP Network Using a Ping Utility .................................................6-5
Testing the LAN Path to Your Router .......................................................................6-5
Testing the Path from Your Computer to a Remote Device .....................................6-6
Restoring the Default Configuration and Password ........................................................6-7
Appendix A
Technical Specifications
Appendix B
Network, Routing, and Firewall Basics
Related Publications ...................................................................................................... B-1
Basic Router Concepts .................................................................................................. B-1
What is a Router? ................................................................................................... B-1
Routing Information Protocol ................................................................................... B-2
IP Addresses and the Internet ....................................................................................... B-2
Netmask .................................................................................................................. B-4
Subnet Addressing .................................................................................................. B-4
Private IP Addresses ............................................................................................... B-7
Single IP Address Operation Using NAT ....................................................................... B-7
MAC Addresses and Address Resolution Protocol ................................................. B-8
Related Documents ................................................................................................. B-9
Domain Name Server .............................................................................................. B-9
IP Configuration by DHCP ........................................................................................... B-10
Internet Security and Firewalls .................................................................................... B-10
What is a Firewall? ................................................................................................ B-10
Stateful Packet Inspection ......................................................................................B-11
Denial of Service Attack .........................................................................................B-11