# Point-to-Point Links in Virtual Labs

DevFeed: [Point-to-Point Links in Virtual Labs](<https://devfeed.tech/articles/point-to-point-links-in-virtual-labs-11143.md>)

Original publisher: [Read original article](<https://blog.ipspace.net/2025/02/virtual-labs-p2p-links/>)

Published: 2025-02-12T06:55:00Z

Content type: tutorial

Language: en

Sources: [ipSpace.net blog](<https://devfeed.tech/sources/ipspace-net-blog.md>)

Topics: [virtual machines](<https://devfeed.tech/topics/virtual-machines.md>), [qemu](<https://devfeed.tech/topics/qemu.md>), [Vagrant](<https://devfeed.tech/topics/vagrant.md>), [Containers](<https://devfeed.tech/topics/containers.md>), [Linux](<https://devfeed.tech/topics/linux.md>), [Command-line interface](<https://devfeed.tech/topics/cli.md>)

Tags: [blog-post](<https://devfeed.tech/tags/blog-post.md>), [cli](<https://devfeed.tech/tags/cli.md>), [container-networking](<https://devfeed.tech/tags/container-networking.md>), [containers](<https://devfeed.tech/tags/containers.md>), [linux](<https://devfeed.tech/tags/linux.md>), [netlab](<https://devfeed.tech/tags/netlab.md>), [networking](<https://devfeed.tech/tags/networking.md>), [qemu](<https://devfeed.tech/tags/qemu.md>), [vagrant](<https://devfeed.tech/tags/vagrant.md>), [virtual-machines](<https://devfeed.tech/tags/virtual-machines.md>), [virtualization](<https://devfeed.tech/tags/virtualization.md>)

## AI overview

This article explains how virtual labs connect virtual machines and Linux containers. It covers UDP tunnels used by KVM/QEMU/libvirt/Vagrant, point-to-point vEth links created by containerlab, and the packet-capture limitations of UDP tunnels.

## Source excerpt

In the previous blog post, I described the usual mechanisms used to connect virtual machines or containers in a virtual lab, and the drawbacks of using Linux bridges to connect virtual network devices. In this blog post, we'll see how KVM/QEMU/libvirt/Vagrant use UDP tunnels to connect virtual machines, and how containerlab creates point-to-point vEth links between Linux containers. Read more ...