Mesh Network Transparent Tunneling With Virtual Bridge NAT Traversal
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Solution Overview
Problem
Wireless networks face communication issues due to network address translation (NAT) limitations, which require manual provisioning of port forwarding rules, and existing solutions like IPsec tunnels are not transparent to non-IP traffic and require complex configurations.
Innovation Solution
A method involving a configuration file that establishes a virtual bridge and dual tunnels (IPsec and L2TP) over a wireless network to facilitate transparent communication between devices, bypassing NAT protocols and enabling link layer connectivity without routers or port forwarding rules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual provisioning of port forwarding rules is implemented to enable device communication, then device connectivity is achieved, but system complexity and configuration difficulty increase
Solution Approach 1:
The patent introduces an intermediary device (access point or gateway) that automatically manages port forwarding rules and tunnel configurations. This intermediary handles the complex routing protocols and NAT traversal, while end devices simply use link layer addressing without manual configuration. The intermediary mediates between the simple end devices and the complex network infrastructure, resolving the contradiction between ease of operation and device complexity.
Solution Approach 2:
The system enables devices to automatically establish communication tunnels and configure themselves using link layer addressing without requiring manual port forwarding rules. Devices self-configure by obtaining tunnel endpoint information through the intermediary and automatically establishing encrypted tunnels, eliminating the need for users to manually provision complex routing configurations while maintaining full device connectivity.
2Reliability
If IPsec tunnels are used to provide secure communication, then security is improved, but transparency to non-IP traffic is lost and configuration complexity increases
Solution Approach 1:
The patent segments the tunneling functionality into separate components: an outer IPsec tunnel for security and an inner L2TP tunnel for transparency. This segmentation allows each protocol to perform its specialized function - IPsec provides encryption and security at the network layer, while L2TP provides transparent link layer encapsulation that works with both IP and non-IP traffic. The segmentation resolves the contradiction by allowing security and transparency to coexist without requiring a single complex solution.
Solution Approach 2:
The patent implements nested tunneling where an L2TP tunnel is encapsulated within an IPsec tunnel. The inner L2TP tunnel handles traffic transparently including non-IP protocols, while the outer IPsec tunnel provides security. This nested structure allows the system to benefit from both protocols simultaneously - the simplicity and transparency of L2TP combined with the security of IPsec - without the configuration complexity of trying to make a single protocol do both jobs.
3Ease of operation
If NAT protocols are implemented for network address translation, then network connectivity is enabled, but communication transparency and speed are reduced
Solution Approach 1:
The patent moves the communication from the network layer (where NAT operates) to the link layer by using L2TP encapsulation with link layer addressing. This dimensional change allows devices to communicate directly using MAC addresses and link layer protocols, bypassing the NAT translation process entirely. The tunnel endpoints are identified using link layer addresses rather than IP addresses, enabling direct communication without NAT-induced delays while maintaining network connectivity through the tunnel infrastructure.
Data Source
AI summary
In an example, a method may include a configuration file being provided to a first device from a network server. The configuration file may be provided after establishment of a first wireless connection over a wireless network between the first device and the network server. The configuration file may direct the first device to establish a virtual bridge and the network server may be configured to map a first tunnel and/or a second tunnel to the virtual bridge. The configuration file may further direct the first device to establish the first tunnel between the virtual bridge and the network server. The configuration file may also direct the first device to establish the second tunnel within the first tunnel. The second tunnel may be established. The method may also include facilitating communications between the first device and a second device via the virtual bridge using the second tunnel.