Contents
vii
202-10090-01, April 2005
Power LED Not On
...................................................................................................
7-1
LEDs Never Turn Off
................................................................................................
7-2
Local or Internet Port LEDs 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
.................................................
7-5
Testing the LAN Path to Your Router
.......................................................................
7-5
Testing the Path from Your PC to a Remote Device
................................................
7-6
Restoring the Default Configuration and Password
........................................................
7-7
Problems with Date and Time
.........................................................................................
7-7
Appendix A
Technical Specifications
Appendix B
Network, Routing, Firewall, and 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
Ethernet Cabling
...........................................................................................................
B-11
Category 5 Cable Quality
......................................................................................
B-12
Inside Twisted Pair Cables
....................................................................................
B-12
Uplink Switches, Crossover Cables, and MDI/MDIX Switching
............................
B-14