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2025-04-11T21:19:45+00:00 false Setting up Unique Local Addresses (ULA) on OPNsense
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!