[Bug 213365] An error in Handbook IPFW example for NTP

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213365

            Bug ID: 213365
           Summary: An error in Handbook IPFW example for NTP
           Product: Documentation
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: Documentation
          Assignee: freebsd-doc at FreeBSD.org
          Reporter: petri.riihikallio at metis.fi

About half way through https://www.freebsd.org/doc/handbook/firewalls-ipfw.html
it says:

# Allow outbound NTP
$cmd 00260 allow tcp from any to any 37 out via $pif setup keep-state

But that doesn’t allow NTP. NTP uses UDP 123. TCP 37 is the obsolete TIME
protocol. (Unless I am completely at a loss, of course.)

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