Linux Security HOWTO : Network Security : Verify Your DNS Information
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8.3. Verify Your DNS Information

Keeping up-to-date DNS information about all hosts on your network can help to increase security. If an unauthorized host becomes connected to your network, you can recognize it by its lack of a DNS entry. Many services can be configured to not accept connections from hosts that do not have valid DNS entries.


Linux Security HOWTO : Network Security : Verify Your DNS Information
Previous: System services and tcp_wrappers
Next: identd