One approach is to use the PAN itself to secure the management interface. Meaning you put the management interface into a zone that is managed by the PAN so then you can use all sorts of different options to secure the management interface, i.e. source/destination IP, zone, user-id, etc.
What's the point of even putting in permitted IPs if you're enabling an entire /8 network? Regardless, 8.1.* and 8.0.* will allow you to do this perfectly fine without complaint, are you trying to actually include '10/8' or '10.0.0.0/8', because it would need to be the second option.
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