def add_internal_subnet(self, context_id, subnet_id):
        """Add an internal subnet to a tunnel context.

        :param int context_id: The id-value representing the context instance.
        :param int subnet_id: The id-value representing the internal subnet.
        :return bool: True if internal subnet addition was successful.
        """
        return self.context.addPrivateSubnetToNetworkTunnel(subnet_id,
                                                            id=context_id)
Add an internal subnet to a tunnel context.

        :param int context_id: The id-value representing the context instance.
        :param int subnet_id: The id-value representing the internal subnet.
        :return bool: True if internal subnet addition was successful.