What is the bridge on RouterOS?

On MikroTik RouterOS products, you have the possibility to make a bridge configuration. The bridge has 2 functions:

  1. You can bridge 2 or more ethernet ports so they act like switch ports.
  2. You can bridge 2 different network technologies (like Ethernet and Wireless), so they become like 1 network.

Let me explain the 2 points more clearly.

Point 1: Say that you have a router connected to the internet on its interface Ether1. You want that you share the internet from this router so anyone who is connected to any of the other router’s Ether ports he can have internet. Then what you want to do, you create a bridge internet and you put the rest Ethernet ports inside this bridge and you put on the bridge interface the IP address, afterword you do the NAT. This way, anyone who connects to any of the other Ethernet interfaces, he can have internet.

One thing to mention here: once you bridge Ethernet ports then any traffic going from one Ethernet interface to another Ethernet interface, which are on the same bridge, will not go to the router CPU anymore. That’s because of the switch ship which can do switching of the traffic without the need to take resources from the CPU of the router. This is called Hardware Offloading, and MikroTik has added this feature since RouterOS version 6.41 and up.

Point 2: Let’s imagine that you already have set the bridge between all Ethernet interfaces, then you decided that you want also to provide internet via Wireless (WLAN). You can simply add the WLAN interface inside this bridge, and you will be able to provide internet via wireless. This way, you are bridging 2 different network technologies together, which are Ethernet and Wireless LAN.

That’s all what I wanted to explain about bridging, let’s apply this in a LAB now and see how we can create a Bridge on the MikroTik RouterOS.

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