[Bug 233015] arp -s weird error with non-local IPs

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233015

            Bug ID: 233015
           Summary: arp -s weird error with non-local IPs
           Product: Base System
           Version: CURRENT
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: vince at macports.org

arp -s reports a weird error “cannot allocate memory” when instructed to
masquerade an ARP - IP entry whose IP is out of the local network window (e.g.
172.31.1.0 on a 172.31.0.0/24 network).

It would be more informative for the user to have the error reported as an “out
of range IP” or something of the same ilk, since “cannot allocate memory” gives
the false impression something is broken within the kernel.

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