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1.9 Protecting Network and Modem Access

Topics include protecting access to your modems and networks from a variety of attacks. These attacks range from a rogue easily determining what the phone number of your modem is to intruders tapping your phone lines. Strategies from making wardialing attempts to find your modems difficult to preventing intruders bridging into your internal networks to get at unprotected systems are covered.

Wardialing means dialing a large number of phone numbers in sequence to determine which ones have modems attached. Frequently, the wardialing software can analyze the type of system that answered by the login prompt. It will try common account names and passwords and system-specific attacks.

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