[Bug 252554] dumpon doesn't work with -z or -Z options?

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252554

            Bug ID: 252554
           Summary: dumpon doesn't work with -z or -Z options?
           Product: Base System
           Version: 12.2-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: dmilith at me.com

I'm playing with NETDUMP kernel feature and dumpon manpage says that both -z
and -Z options are accepted. But they're not?

Specifying -z or -Z like this: dumpon -Z -s IP1 -c IP2 fails with:

dumpon: ioctl(NETDUMPSCONF): Invalid argument

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