To ensure that a HotSpot user in MikroTik is tied to a single device and cannot use another HotSpot client, you can implement a restriction based on the device's MAC address.

We explain how to do it:

1. HotSpot configuration in MikroTik: First, make sure you have the HotSpot service configured on your MikroTik, including user authentication.
2. Static IP Address Assignment: Assign static IP addresses to the devices you want to link to HotSpot users. This will ensure that each device always has the same IP address when connecting to the HotSpot.
3. Firewall Settings- Uses firewall rules to allow Internet access only from IP addresses assigned to specific devices. You can configure inbound filter rules in the firewall filtering table to allow traffic only from specific IP addresses.
4. Restriction by MAC address: Add a rule to the firewall that allows access only from the authorized device's MAC address. You can do it using the option mac-address in the firewall rule configuration.
5. User and device pairing: When a user authenticates to the HotSpot, it verifies their MAC address and assigns the static IP address associated with the device. This will ensure that the user is linked to the specific device.
6. Monitoring and management: Regularly monitor HotSpot authentication logs to detect any unauthorized access attempts. Additionally, you can set alerts or notifications to inform you of suspicious activities.

By implementing these measures, you can ensure that each HotSpot user is tied to a single device and cannot use another HotSpot client without authorization. This will provide an additional layer of security and control over your network.