Yes, the MikroTik RB750Gr3, also known as MikroTik Hex, is capable of handling load balancing between multiple Ethernet lines, including the ability to balance three Ethernet connections.

This device is quite popular for its efficiency and flexibility for various network configurations.

We explain how you can configure it to balance three Ethernet lines:

Steps to Configure Load Balancing on a MikroTik RB750Gr3:

1. Interface Preparation

Make sure that the three Ethernet lines are correctly connected to three of the MikroTik router's Ethernet interfaces. For example, you can connect them to the ports ether1, ether2, and ether3.

2. Configuration of Interfaces and IP Addresses

Assign appropriate IP addresses to each interface, depending on your network and ISP settings.

/ip address
add address=192.168.1.2/24 interface=ether1 network=192.168.1.0
add address=192.168.2.2/24 interface=ether2 network=192.168.2.0
add address=192.168.3.2/24 interface=ether3 network=192.168.3.0

3. Route Configuration

Configure default routes for each Internet connection so that traffic can be routed correctly through each line.

/ip route
add distance=1 gateway=192.168.1.1
add distance=1 gateway=192.168.2.1
add distance=1 gateway=192.168.3.1

4. Load Balancing Configuration

MikroTik offers several strategies for load balancing, such as NTH or PCC (Per Connection Classifier). A common method is NTH, which allows connections to be distributed equally among the available lines.

/ip firewall mangle
add chain=prerouting action=mark-connection new-connection-mark=conn1 passthrough=yes connection-state=new nth=3,1
add chain=prerouting action=mark-connection new-connection-mark=conn2 passthrough=yes connection-state=new nth=3,2
add chain=prerouting action=mark-connection new-connection-mark=conn3 passthrough=yes connection-state=new nth=3,3

/ip route
add distance=1 gateway=192.168.1.1 routing-mark=conn1
add distance=1 gateway=192.168.2.1 routing-mark=conn2
add distance=1 gateway=192.168.3.1 routing-mark=conn3

5. Tests and Adjustments

Once configured, it is vital to perform tests to ensure that traffic is being correctly balanced between the three lines. You can monitor the traffic on each interface to see if the load is distributed as desired.

Final Considerations

• Security: Don't forget to set up appropriate security measures to protect your network.
• Structural: Maintain constant monitoring to adjust and optimize network performance as necessary.

With these steps, your MikroTik RB750Gr3 should be able to effectively handle load balancing between three Ethernet lines, thus improving the redundancy and availability of your Internet connection.