code: def add(self, networkipv6_id, ipv6_id):
          
  
          data = dict()
  
          data['networkipv6'] = networkipv6_id
          data['ipv6'] = dict()
          data['ipv6']['id'] = ipv6_id
          uri = 'api/dhcprelayv6/'
          return self.post(uri, data=data)
docs: List all DHCPRelayIPv4.
  
          :param: Object DHCPRelayIPv4
  
          :return: Following dictionary:
            {
            "networkipv6": <networkipv4_id>,
            "id": <id>,
            "ipv6": {
                "block1": <block1>,
                "block2": <block2>,
                "block3": <block3>,
                "block4": <block4>,
                "block5": <block5>,
                "block6": <block6>,
                "block7": <block7>,
                "block8": <block8>,
                "ip_formated": "<string IPv6>",
                "networkipv6": <networkipv6_id>,
                "id": <ipv6_id>,
                "description": "<string description>"
            }
  
          :raise NetworkAPIException: Falha ao acessar fonte de dados