Yes. All filters have an implicit deny at the end, anything no *explicitly*
permitted is denied. You can have a bunch of denies and then:
permit 0.0.0.0/0 0.0.0.0/0
And everything not explicitly denied will get through. But generally you
want to explicitly permit only what you need and deny everything else.
The philosphy is that if you forget to permit something, you will notice
and fix it.
If we allowed everything not denied by default, you wouldn't realize you
forgot to deny a security hole until it was too late.
-MZ
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