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From the code:
        # N.B. privnet is setup first even before the default route.
        # This is because the gateway for the default route is on the
        # privnet, but our control net interface is not (because it has
        # a 255.255.255.255 netmask by virtue of being an alias on the
        # real control interface).  Thus there is no way to use the
        # default route until the privnet route is up (ARP complains
        # about "host is not on local network").