So here's how PPTP works with these two features:
1. The PPTP IP range is a different range than the DHCP range. You get an error message if your PPTP IP range overlaps with the DHCP one.
I didn't test the 'Block MAC' function because since the IP isn't coming from the DHCP pool, I highly doubt any MAC blocking will work.
2. Since your PPTP IP address range is outside of the DHCP range, this point is completely taken off the table. However, if you choose an IP range that's outside of the subnet, you'll get an error message when saving. I also learned that if you set the PPTP IP to just a single number and connect, the router will automatically reject any additional connections since no IPs are available.
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