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Showing content from https://github.com/KatharaFramework/NetworkPlugin below:

KatharaFramework/NetworkPlugin: Docker Network Plugin used by Kathará to create pure L2 networks.

This repository contains the source code for the Docker Network Plugin used by Kathará.

The plugin has two different versions, which are divided in the two main folders:

• vde: creates pure L2 LANs using VDE (Virtual Distributed Ethernet) software switches and tap interfaces (which is built using the kathara/katharanp_vde tag).
• bridge (legacy): creates pure L2 LANs using Linux bridges and veth pairs (which is built using the kathara/katharanp tag).

The plugin is compiled and released for both amd64 and arm64 architectures. The tag of the plugin identifies the architecture.

To build both the plugin versions, type on terminal (in the root of the project):

Where <arch> can be: amd64 or arm64.

NOTE: since the vde version relies on C code, you can only build the Docker plugin for your target architecture!

You can also build only a specific version of the plugin by entering its directory, for example:

$ cd vde && make all_<arch>

The build process leverages on Docker, so you don't need any dependencies installed in your machine.

It is possible to leverage on this plugin as a standalone Docker Network Plugin, in order to create pure L2 networks. Please check the README of each version (inside the corresponding folder) for specific information.

katharanp supports two different ways to assign a MAC Address to a network interface:

• Pass a specific MAC Address, this can be achieved by leveraging the kathara.mac_addr driver option while connecting a container to a network:

docker network connect --driver-opt kathara.mac_addr=aa:bb:cc:dd:ee:ff l2net container

• Compute a deterministic MAC Address using the container name and the interface index, this can be done with the kathara.machine and kathara.iface driver options (they are required together):

docker network connect --driver-opt kathara.machine=container --driver-opt kathara.iface=1 l2net container

The formula to compute the MAC address is the following:

1. Join the two strings, separating the two values by a dash, e.g., container-1
2. Compute the MD5 of the resulting string: b588c219865f6fe336908e5991216b13
3. Take the first 6 hex bytes of the string, starting from the left: b588c219865f -> b5:88:c2:19:86:5f
4. Clean the first byte to obtain a locally administered unicast MAC Address: 0xb5 | 0x02 = 0xb7 & 0xfe = 0xb6
5. The resulting MAC Address is: b6:88:c2:19:86:5f

Example output from the container:

root@584e403aec5a:/# ifconfig eth1
eth1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        ether b6:88:c2:19:86:5f  txqueuelen 1000  (Ethernet)
        RX packets 8  bytes 736 (736.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

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