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Container Networking (Docker)

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Docker networking: virtual bridges and namespaces

Docker creates a virtual bridge (docker0) on the host. Each container gets a network namespace — its own isolated network stack with its own eth0, routing table, and iptables.

A veth pair (virtual Ethernet cable) connects each container's eth0 to the docker0 bridge. The bridge forwards traffic between containers and to the host.

Packets in motion — click to inspect:

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