TN3

IPv6 stateless address autoconfiguration of the WAN interface on a Unifi Security Gateway

The WAN interface on a Unifi Security Gateway (USG) supports static IPv6 address configuration and IPv6 prefix delegation. However it does not officially support the scenario of IPv6 stateless address autoconfiguration. This mode is deployed by some ISPs, notably NTT in Japan.

This note describes the configuration of a USG to operate in this environment.

Configure IPv6 stateless address autoconfiguration on eth0

This requires the creation or modification of a config.gateway.json file on the Unifi controller. On a Unifi Cloud Key controller, this file is located at:

/srv/unifi/data/sites/default/config.gateway.json

The config.gateway.json should include the following nodes:

{
    "interfaces": {
        "ethernet": {
            "eth0": {
                "ipv6": {
                    "address": "autoconf"
                }
            }
        }
    }
}