code: def use_edns(self, edns, ednsflags, payload):
          
  
          if edns is None:
              edns = -1
          self.edns = edns
          self.ednsflags = ednsflags
          self.payload = payload
docs: Configure Edns.
  
          @param edns: The EDNS level to use.  The default is -1, no Edns.
          @type edns: int
          @param ednsflags: The EDNS flags
          @type ednsflags: int
          @param payload: The EDNS payload size.  The default is 0.
          @type payload: int