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Contents vii
202-10051-01, March 2005
Troubleshooting the ISP Connection ..............................................................................8-3
Troubleshooting a TCP/IP Network Using a Ping Utility .................................................8-5
Testing the LAN Path to Your Router .......................................................................8-5
Testing the Path from Your Computer to a Remote Device .....................................8-6
Restoring the Default Configuration and Password ........................................................8-7
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-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-9
IP Configuration by DHCP ........................................................................................... B-10
Internet Security and Firewalls .................................................................................... B-10
What is a Firewall? .................................................................................................B-11
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-13
Uplink Switches, Crossover Cables, and MDI/MDIX Switching ............................ B-14
Appendix C
Preparing Your Network
What You Need To Use a Router with a Broadband Modem ......................................... C-1
Cabling and Computer Hardware ............................................................................ C-1
Computer Network Configuration Requirements .................................................... C-1