Now that you've seen what a firewall chain listing looks like and what formatting options are available, we'll go through brief lists of INPUT, OUT, and FORWARD rules. The sample rules are representative of some of the rules you'll most likely use yourself.read more.
Traditionally, Unix/Linux/POSIX filenames can be almost any sequence of bytes, and their meaning is unassigned. The only real rules are that "/" is always the directory separator, and that filenames can't contain byte 0 (because this is the terminator). Although this is flexible, this creates many unnecessary problems. In particular, this lack of limitations makes it unnecessarily difficult to write correct programs (enabling many security flaws), makes it impossible to consistently and accurately display filenames, causes portability problems, and confuses users. more ....
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