I have a router gl-mt300n-v2, with software version 3.012, and this is the objective: in my PC I have installed the media server emby, in the IP 192.168.8.151, Port 8096. I need the user to connect to my router only have access to this IP and Port, but not Internet, there is some access control that allows me to do it ?, how I set up for the user X, in Mac X connect to my router and only have access to this page and not to the Internet or anywhere else ?, please I need your help.
You can edit the file /etc/firewall.user, add this line into it.
iptables -I FORWARD -s 192.168.8.0/24 -j DROP
Restart the firewall.