code: def list(self, networkipv4=None, ipv4=None):
          
  
          uri = 'api/dhcprelayv4/?'
          if networkipv4:
              uri += 'networkipv4=%s&' % networkipv4
          if ipv4:
              uri += 'ipv4=%s' % ipv4
  
          return self.get(uri)
docs: List all DHCPRelayIPv4.
  
          :param: networkipv4: networkipv4 id - list all dhcprelay filtering by networkipv4 id
            ipv4: ipv4 id - list all dhcprelay filtering by ipv4 id
  
          :return: Following dictionary:
            [
              {
              "networkipv4": <networkipv4_id>,
              "id": <id>,
              "ipv4": {
                  "oct4": <oct4>,
                  "oct2": <oct2>,
                  "oct3": <oct3>,
                  "oct1": <oct1>,
                  "ip_formated": "<string IPv4>",
                  "networkipv4": <networkipv4_id>,
                  "id": <ipv4_id>,
                  "descricao": "<string description>"
              },
              {...}
            ]
  
          :raise NetworkAPIException: Falha ao acessar fonte de dados