Surveillance Node Tunnel Logic for Isolation Device Bypass
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Solution Overview
Problem
The complexity of video surveillance systems in IP surveillance networks, particularly due to Network Address Translation (NAT), firewalls, and security isolation gateways, leads to issues such as address mapping waste, port opening requirements, and confusion in internal information forwarding, making service development and deployment challenging.
Innovation Solution
A method using a surveillance node with tunnel processing logic to establish and manage L2TP tunnel connections, allowing for the decapsulation and encapsulation of packets to bypass network isolation devices, thereby simplifying communication and reducing the need for extensive port mapping and address allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If NAT device is used to handle IP address translation, then address resource constraint is solved, but signaling complexity increases and internal address information becomes non-uniform
Solution Approach 1:
The patent introduces a tunnel server as an intermediary component that mediates communication between internal surveillance nodes and external networks. The tunnel server handles address translation and signaling coordination, isolating the complexity from the surveillance system itself. This allows the surveillance system to work with simple internal IP addresses while the tunnel server manages the complexity of NAT traversal and address mapping.
2Reliability
If firewall is used to secure network, then security is improved, but port opening requirements increase and service deployment becomes complex
Solution Approach 1:
The tunnel server acts as an intermediary that establishes secure tunnel connections through the firewall without requiring multiple port openings. Instead of opening numerous ports for different surveillance services, the system uses a single tunnel endpoint that encapsulates all surveillance traffic, simplifying firewall configuration while maintaining security.
3Reliability
If security isolation gateway is used to isolate networks, then network security is improved, but gateway development complexity increases for each new feature
Solution Approach 1:
The patent extracts the complex gateway functionality into a separate tunnel server component that operates independently from the surveillance system. This allows the surveillance system to remain simple and standardized while the tunnel server handles all the complex isolation and feature implementation. When new features are needed, only the tunnel server needs to be updated, not the entire surveillance system or gateways.
4Ease of operation
If tunnel connection is established for each surveillance service, then network isolation is bypassed, but connection establishment process becomes complex
Solution Approach 1:
The patent merges multiple surveillance service connections into a single tunnel connection. Instead of establishing separate connections for each surveillance service through the isolation device, all surveillance traffic is encapsulated and transmitted through one unified tunnel channel. This simplifies connection management while maintaining the ability to provide multiple surveillance services.
Data Source
AI summary
The present invention provides a method for a surveillance node to pass through a network isolation device in an IP surveillance system. The method comprises steps of using a first IP address of a surveillance node per se to initiate a tunnel connection request towards a tunnel server, so as to establish a tunnel connection with the tunnel server. After establishing the tunnel connection, the step is obtaining a second IP address distributed by the tunnel server from the tunnel server, and decapsulating a tunnel packet received from the tunnel server to obtain an inner-layer IP packet indicating the content is surveillance signaling. The method further comprises the step of processing the surveillance signaling, encapsulating the surveillance signaling generated by the surveillance node into the inner-layer IP packet, and then encapsulating the inner-layer IP packet into the tunnel packet and sending the same to the tunnel server. The tunnel server forwards the inner-layer IP packet to a surveillance node of an outside network of a network isolation device. The present invention can effectively assist a surveillance node in a surveillance system to pass through a network isolation device, and solve various service problems caused by the isolation device.