Contents
iii
Chapter 7
Troubleshooting ...................................................................................................................7-1
Basic Functions ..............................................................................................................7-1
Power LED Not On ...................................................................................................7-2
All LEDs Stay On ......................................................................................................7-2
Local Link LEDs Not On ...........................................................................................7-2
Cable Link LED Not On ............................................................................................7-2
Troubleshooting the Web Configuration Interface ..........................................................7-3
Troubleshooting the ISP Connection ..............................................................................7-4
Troubleshooting a TCP/IP Network Using a Ping Utility .................................................7-4
Testing the LAN Path to Your Gateway ....................................................................7-4
Testing the Path from Your PC to a Remote Device ................................................7-5
Appendix A
Technical Specifications .................................................................................................... A-1
Appendix B
Networks, Routing, and Firewall Basics ........................................................................... B-1
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
Wireless Networking Overview .....................................................................................B-11
Infrastructure Mode ................................................................................................B-11
