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New post: Setting up Unique Local Addresses (ULA) on OPNsense
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Henry V Child 2025-04-12 18:34:43 +02:00
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---
date: 2025-04-12T21:18:30+01:00
draft: false
title: Setting up Unique Local Addresses (ULA) on OPNsense
tags:
- Post
- IPv6
- Networking
---
Setting up unique local addresses on OPNsense is very easy however not very well documented. This is how to configure then
Firstly create a unique local IPv6 prefix. This should be according to RFC4193. You can use this website (or similar websites) to generate the address.
https://www.unique-local-ipv6.com/#
Next, create a virtual IP on an interface with the desired IP for said interface. From the generator you will receive a /48 network, pick a subnet from this address range for your local network.
For example I used the virtual IP `fd7a:18a6:838d::1/64` for my LAN interface.
The router should be reachable using the address configured an should router advertisements be configured correctly then nodes on that network should generate a their own unique local address on that network!