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Contents ix
G
Firewall design rules......................................... 13-32
Filter basics..................................................... 13-35
Example filters ................................................. 13-36
Chapter 14 — Utilities and Diagnostics ...................................14-1
Ping............................................................................ 14-2
Trace Route................................................................. 14-5
Telnet client................................................................. 14-6
Disconnect Telnet console session ............................... 14-7
Factory defaults........................................................... 14-7
Transferring configuration and firmware files with TFTP.... 14-8
Updating firmware .............................................. 14-8
Downloading configuration files ........................... 14-9
Uploading configuration files ............................. 14-10
Transferring configuration and firmware files with
XMODEM................................................................... 14-10
Updating firmware ............................................ 14-11
Downloading configuration files ......................... 14-12
Uploading configuration files ............................. 14-12
Restarting the system................................................ 14-13
Part III: Appendixes
Appendix A — Troubleshooting..................................................A-1
Configuration problems .................................................. A-1
Console connection problems ............................... A-2
Network problems ................................................ A-2
How to reset the router to factory defaults ...................... A-3
Power outages............................................................... A-3
Technical support .......................................................... A-4
How to reach us................................................... A-4
Appendix B — Understanding IP Addressing ..............................B-1
What is IP?.................................................................... B-1
About IP addressing....................................................... B-1