Port knocking: a security idea whose time has come
Many, many innovations come from the Linux and Unix world. Few are more intriguing to me than port knocking. As a global security plug-in to protect services, it has a lot going for it and few downsides. However, for one reason or another, it suffers from lack of use and understanding. A lot of administrators may have heard of it, but few know how to implement it. Even fewer have used it.
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