When people first start learning container networking, terms like network namespaces , veth pairs , and routing tables can sound complicated.

But under the hood, the idea is surprisingly simple.

Recently, I spent some time experimenting with Linux networking directly from the terminal to better understand how containers communicate internally. In this post, I’ll walk through the process step by step and explain what each command actually does instead of only showing commands to copy and paste.

Understanding the Linux Network Stack

Linux networking is built around network interfaces.

A network interface is simply a communication point between your machine and a network.

To see all available interfaces:

ip link show

Enter fullscreen mode

Exit fullscreen mode

You will usually notice interfaces like:

lo → Loopback interface

eth0 → Main Ethernet interface

The ip command comes from the iproute2 package and is one of the most important networking tools in Linux.

The Loopback Interface

The loopback…