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