    # File lib/fog/aws/requests/compute/modify_network_interface_attribute.rb, line 47
            def modify_network_interface_attribute(network_interface_id, attribute, value)
              response = Excon::Response.new
              if self.data[:network_interfaces][network_interface_id]
                nic = self.data[:network_interfaces][network_interface_id]

                case attribute
                when 'description'
                  nic['description'] = value.clone
                when 'groupSet'
                  groups = {}
                  value.each do |group_id|
                    name = self.data[:security_groups].select { |k,v| v['groupId'] == group_id } .first.first
                    if name.nil?
                      raise Fog::Compute::AWS::Error.new("Unknown security group '#{group_id}' specified")
                    end
                    groups[group_id] = name
                  end
                  nic['groupSet'] = groups
                when 'sourceDestCheck'
                  nic['sourceDestCheck'] = value
                when 'attachment'
                  if nic['attachment'].nil? || value['attachmentId'] != nic['attachment']['attachmentId']
                    raise Fog::Compute::AWS::Error.new("Illegal attachment '#{value['attachmentId']}' specified")
                  end
                  nic['attachment']['deleteOnTermination'] = value['deleteOnTermination']
                else
                  raise Fog::Compute::AWS::Error.new("Illegal attribute '#{attribute}' specified")
                end

                response.status = 200
                response.body = {
                  'requestId' => Fog::AWS::Mock.request_id,
                  'return'    => true
                }

                response
              else
                raise Fog::Compute::AWS::NotFound.new("The network interface '#{network_interface_id}' does not exist")
              end
            end