Should I enable IP/MAC binding on ISP interface?

Hi @tesagig
Normally, you won’t enable IP/MAC binding on the firewall with the ISP router. Or, do you mean you need to configure IP/MAC binding on the ISP router?

The concept of IP/MAC binding is to configure a “static DHCP IP” with a device’s mac address to avoid the DHCP server would assign a dynamic DHCP IP to the device, for example, we configure IP/MAC bind profile that IP is 192.168.1.66 and its mac address is AA:BB: CC:11:22:33 then the DHCP server will always a static DHCP IP 192.168.1.66 for the device(AA:BB: CC:11:22:33). Thus we usually configure IP/MAC binding on LAN interface to bind the specific LAN hosts(e.g. internal web server, NAS server, etc.) to fix their internal DHCP IP addresses, you could refer to this link to see how it works, thanks .