Comtrend Corporation NexusLink 3120 User Manual page 212

STEP 4: Select DNS Server Interface from available WAN interfaces OR enter
static DNS server IP addresses for the system. In ATM mode, if only a
single PVC with IPoA or static IPoE protocol is configured, Static DNS
server IP addresses must be entered.
Select the configured WAN interface for IPv6 DNS server information OR enter the
static IPv6 DNS server Addresses. Note that selecting a WAN interface for IPv6 DNS
server will enable DHCPv6 Client on that interface.
Click Next to continue or click Back to return to the previous step.
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