To confirm that you are not in a double-NAT situation, login to your AC87U and see what IP address it obtained (WAN IP). If it starts with 192.168.X.X, then the AC87U is in a double-NAT situation and bridging is not setup on the Shaw modem.
If you have a different looking IP address, then it should mean the AC87U has a public IP address and bypasses the routing and firewall functionality of the Shaw modem. You can set all of your port-forwarding options on the AC87U, the settings on the Shaw modem will have no effect.
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