Uploaded December 2023 | Updated September 2026, 3 weeks ago

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You've probably heard all about creating multiple VLANs, for things like your IoT network, guest wifi, and more. But do you know what a VLAN actually is, and what the difference is between a VLAN and a Subnet? Today I'm going to cover the numbering of subnets in your network, and how to set up new subnet and VLAN interfaces in OPNsense. Come along on this adventure!

This video is sponsored by Tronsmart, and their T7 portable Bluetooth speaker:
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Find the diagrams in my blog post:
apalrd.net/posts/2023/opnsense_subnet

Support me on Ko-Fi if you enjoy my content and find it useful:
ko-fi.com/apalrd

Feel free to chat about my upcoming projects on Discord!
discord.gg/xJsaEukAr4

For anyone who's still curious why NAT is bad:
tailscale.com/blog/how-nat-traversal-works

Timestamps:
00:00 - Introduction
02:07 - Why Subnet?
07:59 - Subnet Demonstration
11:39 - Scaling Problem
16:22 - VLAN Demonstration
18:44 - Numbering Plan
25:40 - IPv6 Private Addressing (ULA)
30:06 - Future Topics

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