[Bug 247695] Is customizing /etc/rc.firewall risky?

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=247695

            Bug ID: 247695
           Summary: Is customizing /etc/rc.firewall risky?
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: conf
          Assignee: bugs at FreeBSD.org
          Reporter: jwb at freebsd.org

Is it really advisable to customize /etc/rc.firewall as the handbook suggests
for client and simple rule sets?

I think we would want to update this file via freebsd-update at times, in which
case preserving local modifications would be a nightmare as there's no telling
what people might stick in there.

Would it perhaps be better to add something like

. /etc/rc.firewall.local

and tell users to put there customizations there?

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