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Chapter 2 War Dialing > Out-of-Band Support Channels

Out-of-Band Support Channels

Although many network administrators have moved as far away from dial-up access as possible, there still exists a need to implement modems for communications for a variety of situations. One of the most frequent implementations encountered involves using modems as an out-of-band communications solution for managing network equipment such as routers and switches. Out-of-band communications provide administrators the capability of remotely managing devices should traditional local area network or wide area network connectivity become unreliable or unavailable.

Although modems may be implemented for the purpose of out-of-band communications, poor implementation of such devices may provide an avenue of attack allowing attackers to gain access to the core backbone of the network. If an attacker is able to connect to a router via a poorly secured modem and successfully authenticate, there are many type of attacks that can be performed that may reduce the confidentiality, integrity, and availability of the network and the data that passes through it.


  

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