Comtrend Corporation NexusLink 3120 User Manual page 214

F2.7 IP over ETHERNET (IPoE) – IPv6
STEP 1: Select the IP over Ethernet radio button and click Next. *Then select
IPv6 only from the drop-down box at the bottom off the screen and click
Next.
*
For tagged service, enter valid 802.1P Priority and 802.1Q VLAN ID.
For untagged service, set -1 to both 802.1P Priority and 802.1Q VLAN ID
Select a TPID if VLAN tag Q-in-Q is used.
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