As you can see, SSH servers have a tremendous number of configuration options, and in some cases, multiple ways to achieve the same results. All this power comes at a price, however. When setting up a secure system, it is vital to consider each option carefully and select appropriate values. Don't skimp on understanding: the security of your systems may depend on it. Chapter 10 lists configurations for OpenSSH and Tectia. In addition, all the keywords and options in this chapter appear in Appendix E.
Remember that serverwide configuration is only one avenue for affecting server behavior. We discuss compile-time configuration in Chapter 4 and per-account configuration in Chapter 8.