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This approach is usually called ''proactive security''. There are some operating systems which are ''secure by default''. Amongst others, the free BSD flavours ([[FreeBSD]], [[NetBSD]], and [[OpenBSD]]) are proactively secure. For example, the output of netstat on a NetBSD 3.0 workstation clearly outlines this technique:
<syntaxhighlight lang="
$ netstat -a
Active Internet connections (including servers)
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</syntaxhighlight>
The following example from a BSD system
<syntaxhighlight lang="
$ sockstat -4
USER COMMAND PID FD PROTO LOCAL ADDRESS FOREIGN ADDRESS
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