Edge Routing Ingress Traffic Without NAT
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Solution Overview
Problem
Existing technologies face challenges in efficiently routing ingress traffic for logically isolated networks without performing network address translation (NAT), particularly when dealing with public and private IP blocks.
Innovation Solution
Implementing a system that associates route tables with ingress traffic to logically isolated networks, allowing for the routing of ingress traffic destined for public or private IP blocks without performing NAT, by using edge routing devices and network appliances to manage and direct traffic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If network address translation (NAT) is performed for ingress traffic to logically isolated networks, then routing flexibility is improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent extracts the NAT function from the routing process by introducing a separate network address translation service that operates independently. This allows routing decisions to be made based on original IP addresses without the complexity of NAT processing, separating the concerns of address translation from traffic routing and reducing overall system complexity.
Solution Approach 2:
The patent introduces a route table as an intermediary data structure that maps public IP address blocks to logically isolated networks without requiring NAT. This intermediary mechanism enables direct routing based on destination IP addresses, eliminating the need for complex NAT processing while maintaining routing flexibility.
2Reliability
If NAT is performed for all ingress traffic, then network security is improved through address masking, but processing time and loss of time increase
Solution Approach 1:
The patent performs preliminary routing decisions using route tables that are pre-configured with public IP address block mappings. By making routing decisions before NAT processing based on the original destination IP address, the system eliminates unnecessary NAT operations for traffic that can be directly routed to logically isolated networks, reducing processing time while maintaining security through controlled access.
3Ease of manufacture
If NAT is used for routing ingress traffic, then network address management is simplified, but integration of security appliances and network appliances becomes more complex
Solution Approach 1:
The patent extracts the network address management function into a separate route table configuration system that operates independently from security and network appliance integration. This allows security appliances to operate on original IP addresses without being complicated by NAT transformations, simplifying their integration while maintaining straightforward address management through the route table.
4Reliability
If NAT processing is performed for ingress traffic, then network address translation capability is improved, but manufacturing precision and configuration accuracy decrease
Solution Approach 1:
The patent introduces a route table as an intermediary configuration mechanism that provides precise mapping between public IP address blocks and logically isolated networks. This intermediary structure enables accurate configuration without the complexity of NAT, maintaining translation capability where needed while improving configuration accuracy through explicit route definitions.
Data Source
AI summary
Route tables may be associated with ingress traffic for logically isolated networks. A routing device at the edge of a logically isolated network may receive a route to include in a route table that is associated with ingress traffic to the logically isolated network, where the ingress traffic is destined for a block of public or private IP addresses. The route instructs the edge routing device to forward such ingress traffic to a network interface of a network appliance hosted in the logically isolated network. Network packets received at the edge routing device may have a destination of one or more public or private IP addresses in the block of public/private IP addresses. The edge routing device may identify the route in the route table that forwards the ingress network traffic destined for the block of public or private IP addresses to the network interface for the network appliance.