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Chapter 5. Serverwide Configuration

Chapter 5. Serverwide Configuration

After installing an SSH server (sshd),[45] it's time to make informed decisions about your server's operation. Which authentication techniques should be permitted? How many bits should the server key contain? Should idle connections be dropped after a time limit or left connected indefinitely? These and other questions must be considered carefully. sshd has reasonable defaults, but don't accept them blindly. Your server should conform to a carefully planned security policy. Fortunately, sshd is highly configurable, so you can make it do all kinds of interesting tricks.

[45] Tectia's server might also be named sshd2, with sshd being a symbolic link to sshd2. See the upcoming sidebar "Tectia's File-Naming Conventions."

This chapter covers serverwide configuration, in which a system administrator controls the global runtime behavior of the SSH server. This includes a large, rich set of features, such as TCP/IP settings, encryption, authentication, access control, and error logging. Some features are controlled by modifying a serverwide configuration file, and others by command-line options passed to the server at invocation.


  

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