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Contents ix
Troubleshooting a TCP/IP Network Using a Ping Utility .................................................9-6
Testing the LAN Path to Your Firewall ......................................................................9-6
Testing the Path from Your PC to a Remote Device ................................................9-7
Restoring the Default Configuration and Password ........................................................9-8
Using the Default Reset button ................................................................................9-8
Problems with Date and Time .........................................................................................9-8
Troubleshooting the VPN Connection ..........................................................................9-10
Appendix A
Technical Specifications
Appendix B
Networks, Routing, and Firewall Basics
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
Domain Name Server .............................................................................................. B-9
IP Configuration by DHCP .................................................................................... B-10
Ethernet Cabling .......................................................................................................... B-10
Uplink Switches and Crossover Cables .................................................................B-11
Cable Quality ..........................................................................................................B-11
Internet Security and Firewalls .....................................................................................B-11
What is a Firewall? ................................................................................................ B-12
Stateful Packet Inspection ..................................................................................... B-12
Denial of Service Attack ........................................................................................ B-12
Glossary
Index