NAT64 Translation Header Length Optimization
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Solution Overview
Problem
Existing NAT64 translation mechanisms do not efficiently manage overheads such as memory read and write operations, leading to slower translation speeds and increased memory requirements for buffer translator functions.
Innovation Solution
The method involves discovering the NAT64-Prefix by an IPv6 host, generating IPv4 connectivity using a customer-side translator (CLAT) device, and configuring the IPv4 header with dummy options to increase its length, thereby reducing the need for memory operations and improving translation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If standard NAT64 translation is used with default IPv4 header configuration, then translation functionality is provided, but memory read and write operations increase and translation speed decreases
Solution Approach 1:
The patent changes the header length parameter of the IPv4 header from the standard 20 bytes to 40 bytes by adding dummy options. This parameter change allows the translated packet to match the IPv6 header size, eliminating the need for buffer reallocation and memory read/write operations during translation, thereby improving translation speed and reducing memory operation time
Solution Approach 2:
The patent performs preliminary configuration by setting the IPv4 header length to 40 bytes before translation occurs. The CLAT device pre-configures the IPv4 header with dummy options to match IPv6 header size, so that when translation happens, no additional memory operations are needed. This preliminary action prevents the performance degradation that would occur during actual translation operations
2Quantity of substance
If standard NAT64 translation is used with default IPv4 header configuration, then translation functionality is provided, but memory requirements for buffer translator function increase
Solution Approach 1:
By changing the IPv4 header length parameter to 40 bytes (matching IPv6 header size), the patent eliminates the need for buffer allocation and memory operations during translation. This reduces memory requirements for the buffer translator function while simultaneously improving translation efficiency, as the translated packet can be directly sent without additional memory management overhead
Data Source
AI summary
A method of NAT64 translation includes discovering NAT64-Prefix by an IPv6 host, generating IPv4 connectivity by a customer-side translator (CLAT) device according to NAT64-Prefix, notifying the IPv4 connectivity to a private IPv4 (v4p) host, and notifying IPV4 header configuration to the v4p host by the CLAT device. The IPV4 header configuration includes a header length. The method further includes increasing a header length of the IPv4 header by the v4p host.