# Stub Networks in Virtual Labs

DevFeed: [Stub Networks in Virtual Labs](<https://devfeed.tech/articles/stub-networks-in-virtual-labs-11141.md>)

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

Published: 2025-02-25T06:55:00Z

Content type: tutorial

Language: en

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

Topics: [networking](<https://devfeed.tech/topics/networking.md>), [Containers](<https://devfeed.tech/topics/containers.md>), [virtual machines](<https://devfeed.tech/topics/virtual-machines.md>), [qemu](<https://devfeed.tech/topics/qemu.md>)

Tags: [containers](<https://devfeed.tech/tags/containers.md>), [netlab](<https://devfeed.tech/tags/netlab.md>), [networking](<https://devfeed.tech/tags/networking.md>), [networks](<https://devfeed.tech/tags/networks.md>), [qemu](<https://devfeed.tech/tags/qemu.md>), [virtual-machines](<https://devfeed.tech/tags/virtual-machines.md>), [virtualization](<https://devfeed.tech/tags/virtualization.md>)

## AI overview

This article explains how to create stub network segments connected to a single router or switch in virtual labs. It discusses QEMU UDP tunnels and Linux dummy interfaces in containerlab, including compatibility issues with VyOS and Arista cEOS.

## Source excerpt

The previous blog posts described how virtualization products create LAN segments and point-to-point links. However, sometimes we need stub segments - segments connected to a single router or switch - because we don't want to waste resources creating hosts attached to a network device, but would still prefer a more realistic mechanism than static routes to inject IP subnets into routing protocols. Read more ...