Quick Reference Guide

viii Contents
Chapter 7
Troubleshooting
Basic Functioning ...........................................................................................................7-1
Power LED Not On ...................................................................................................7-2
LAN or WAN Port LEDs Not On ...............................................................................7-2
Troubleshooting the Web Configuration Interface ..........................................................7-2
Troubleshooting the ISP Connection ..............................................................................7-3
ADSL link .................................................................................................................7-3
WAN LED Blinking Yellow ..................................................................................7-4
WAN LED Off .....................................................................................................7-4
Obtaining a WAN IP Address ...................................................................................7-4
Troubleshooting PPPoE or PPPoA ..........................................................................7-5
Troubleshooting Internet Browsing ..........................................................................7-6
Troubleshooting a TCP/IP Network Using the Ping Utility ..............................................7-6
Testing the LAN Path to Your Router .......................................................................7-6
Testing the Path from Your Computer to a Remote Device .....................................7-7
Restoring the Default Configuration and Password ........................................................7-8
Using the Reset button .............................................................................................7-8
Appendix A
Technical Specifications
Appendix B
Network and Routing Basics
Related Publications ...................................................................................................... B-1
Basic Router Concepts .................................................................................................. B-1
What is a Router? ................................................................................................... B-2
Routing Information Protocol ................................................................................... B-2
IP Addresses and the Internet ................................................................................. B-2
Netmask .................................................................................................................. B-4
Subnet Addressing .................................................................................................. B-5
Private IP Addresses ............................................................................................... B-7
Single IP Address Operation Using NAT ................................................................. B-8
MAC Addresses and Address Resolution Protocol ................................................. B-9
Related Documents ................................................................................................. B-9
Domain Name Server ............................................................................................ B-10
IP Configuration by DHCP .................................................................................... B-10