Exploring bridges
Bridges in Linux are a key building block for network connectivity. Docker uses them extensively in many of its own network drivers that are included with docker-engine. Bridges have been around for a long time and are, in most cases, very similar to a physical network switch. Bridges in Linux can act like layer 2 or layer 3 bridges.
Note
Layer 2 versus layer 3
The nomenclature refers to different layers of the OSI network model. Layer 2 represents the data link layer and is associated with switching frames between hosts. Layer 3 represents the network layer and is associated with routing packets across the network. The major difference between the two is switching versus routing. A layer 2 switch is capable of sending frames ...
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