Virtual Network Verification via Logic Programming
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Solution Overview
Problem
Conventional network analysis methods, such as port scanning and syntactic checks, are inadequate for verifying virtual networks as they fail to identify complex interrelationships and deviations from security policies, and require substantial network and CPU bandwidth, while also not accounting for the absence of threats or attack vectors.
Innovation Solution
A virtual network verification service using declarative logic programming languages like Datalog to encode virtual networking rules and leverage a constraint solver engine to analyze virtual networks, allowing clients to express queries and verify compliance with security standards and policies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional network analysis methods like port scanning and syntactic checks are used, then network security verification can be performed, but substantial network and CPU bandwidth is required
Solution Approach 1:
The patent creates a virtual copy of the network environment using software-defined networking (SDN) controllers and virtual network functions. Instead of scanning the actual physical network, the system analyzes a virtual representation that replicates network topology, devices, and traffic patterns. This copying approach enables security verification without consuming substantial bandwidth or CPU resources of the physical network infrastructure.
Solution Approach 2:
The patent replaces traditional mechanical network scanning methods (port scanning, packet injection) with software-based analysis using SDN controllers. The SDN controller programmatically accesses network state information through APIs and analyzes security policies using software algorithms, eliminating the need for bandwidth-intensive active scanning and reducing CPU overhead on network devices.
2Measurement precision
If conventional network analysis methods are used, then security threats can be detected, but they fail to identify complex interrelationships and deviations from security policies
Solution Approach 1:
The patent implements a universal SDN controller that performs multiple security analysis functions: topology discovery, policy validation, threat detection, and compliance verification. This single multi-functional system can analyze complex interrelationships between network devices, security policies, and traffic flows, detecting deviations that single-purpose conventional tools cannot identify.
Solution Approach 2:
The SDN controller acts as an intermediary between network devices and security analysis tools. It collects comprehensive state information from the network, processes security policies, and generates security assessments. This intermediary layer enables precise detection of complex security issues by centralizing information and coordination, rather than relying on distributed conventional scanning methods.
3Measurement precision
If port scanning and syntactic checks are performed, then basic network security can be verified, but the absence of threats or attack vectors cannot be accounted for
Solution Approach 1:
The patent performs preliminary security verification by analyzing network topology and security policies before actual threats materialize. The SDN controller continuously monitors network state and validates security configurations proactively, identifying potential vulnerabilities and ensuring compliance before attacks occur. This preliminary action enables verification of threat absence by confirming that security policies are correctly configured and enforced.
Solution Approach 2:
The system implements continuous feedback loops where the SDN controller monitors network traffic, validates security policies in real-time, and adjusts security configurations based on detected anomalies. This feedback mechanism enables the system to account for threat absence by continuously verifying that no unauthorized traffic or attack patterns are present, providing comprehensive security assessment beyond simple presence detection.
4Reliability
If conventional network analysis methods are used, then security verification can proceed, but constant device availability is required
Solution Approach 1:
The SDN controller creates and maintains a virtual copy of the network state that can be analyzed independently of physical device availability. Network topology, device configurations, and traffic patterns are replicated in the software environment, allowing security verification to proceed even when physical devices are temporarily unavailable. This copying approach decouples verification operations from hardware availability requirements.
Solution Approach 2:
The SDN controller serves as an intermediary layer between security analysis tools and physical network devices. It caches network state information and provides programmatic access to topology and configuration data, enabling security verification without requiring constant direct access to physical devices. This intermediary approach maintains verification reliability while reducing ease of operation constraints related to device availability.
Data Source
AI summary
A virtual network verification service for provider networks that leverages a declarative logic programming language to allow clients to pose queries about their virtual networks as constraint problems; the queries may be resolved using a constraint solver engine. Semantics and logic for networking primitives of virtual networks in the provider network environment may be encoded as a set of rules according to the logic programming language; networking security standards and/or client-defined rules may also be encoded in the rules. A description of a virtual network may be obtained and encoded. A constraint problem expressed by a query may then be resolved for the encoded description according to the encoded rules using the constraint solver engine; the results may be provided to the client.