Return a dict of VPC-related limits only.
        This method should only be used internally by
        :py:meth:~.get_limits`.

        :rtype: dict

def _get_limits_networking(self):
        """
        Return a dict of VPC-related limits only.
        This method should only be used internally by
        :py:meth:~.get_limits`.

        :rtype: dict
        """
        limits = {}
        limits['Security groups per VPC'] = AwsLimit(
            'Security groups per VPC',
            self,
            500,
            self.warning_threshold,
            self.critical_threshold,
            limit_type='AWS::EC2::SecurityGroup',
            limit_subtype='AWS::EC2::VPC',
        )
        limits['Rules per VPC security group'] = AwsLimit(
            'Rules per VPC security group',
            self,
            50,
            self.warning_threshold,
            self.critical_threshold,
            limit_type='AWS::EC2::SecurityGroup',
            limit_subtype='AWS::EC2::VPC',
        )
        limits['VPC Elastic IP addresses (EIPs)'] = AwsLimit(
            'VPC Elastic IP addresses (EIPs)',
            self,
            5,
            self.warning_threshold,
            self.critical_threshold,
            limit_type='AWS::EC2::EIP',
            limit_subtype='AWS::EC2::VPC',
            ta_service_name='VPC'  # TA shows this as VPC not EC2
        )
        # the EC2 limits screen calls this 'EC2-Classic Elastic IPs'
        # but Trusted Advisor just calls it 'Elastic IP addresses (EIPs)'
        limits['Elastic IP addresses (EIPs)'] = AwsLimit(
            'Elastic IP addresses (EIPs)',
            self,
            5,
            self.warning_threshold,
            self.critical_threshold,
            limit_type='AWS::EC2::EIP',
        )
        limits['VPC security groups per elastic network interface'] = AwsLimit(
            'VPC security groups per elastic network interface',
            self,
            5,
            self.warning_threshold,
            self.critical_threshold,
            limit_type='AWS::EC2::SecurityGroup',
            limit_subtype='AWS::EC2::NetworkInterface',
        )
        return limits