ethernetInterfaceDHCPv6PrimaryDNSServer 1.3.6.1.4.1.19046.11.1.3.4.1.4.5.3.2.5

The primary DNS server, assigned by the DHCPv6 server. NOTE: If ethernetInterfaceIPv6Enabled or ethernetInterfaceDHCPv6Enabled is disabled or if DHCPv6 server is not available, this object has the value '0:0:0:0:0:0:0:0'.