Web-based Configuration Guide Network Settings
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After IPv6 is enabled, you can configure the IPv6 addresses of WAN and LAN ports, view
the DHCPv6 client, and configure a static DHCPv6 address for the client.
4.17.5 Configuring the IPv6 Address for the WAN Port
In Local Device mode, choose Network > IPv6 Address > WAN Settings.
Configure the IPv6 address for the WAN port, and click Save.