10.5 Summary
Modem and dialup security is a topic that many of
today's security practitioners rarely consider, yet
one that remains of critical importance even in this age of
Internet-based communications. If you use modems with your Unix
system, it is vital that you ensure that the cables are correct and
that the modem is properly configured. Remember: even a modem that
appears to be working properly can cause a grave security threat if
it was improperly set up. If you aren't sure you are
running any modems, conduct a visual inspection of your computers to
be sure. Then check your elevators, your HVAC systems, and your
burglar alarms. These days, lots of systems have modems. You can't be
too careful!
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