Binary Search TTL Determination for Network Diagnostics
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Solution Overview
Problem
Traditional network tracing methods, such as Traceroute, are inefficient and scalable, generating significant network traffic and often blocked in secure environments, making it difficult to determine the destination Time-to-Live (TTL) value in complex network configurations.
Innovation Solution
The method involves sending trace packets with varying TTL values using binary search techniques to efficiently determine the destination TTL, reducing the number of packets required and minimizing network congestion, with adaptive probing using ICMP, UDP, and TCP protocols to overcome blocking issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional Traceroute methods are used to determine network path, then network diagnostics can be performed, but significant network traffic is generated causing congestion
Solution Approach 1:
The patent changes the parameter of TTL incrementation from sequential (1, 2, 3, 4, 5...) to exponential/doubling (1, 2, 4, 8, 16...). This parameter change in the probe packet sending strategy dramatically reduces the number of packets needed to reach the destination TTL, thus reducing network traffic volume while maintaining diagnostic capability
Solution Approach 2:
The patent uses exponential TTL incrementation which can overshoot the destination TTL more quickly than sequential incrementation. This excessive action is acceptable because the protocol includes mechanisms to handle overshoot (reducing TTL and retrying), and the overall packet count is still reduced compared to sequential methods
2Loss of information
If sequential TTL incrementation is used, then all intermediate routers can be discovered, but many trace packets are required increasing time complexity
Solution Approach 1:
The patent changes the TTL incrementation parameter from sequential to exponential (doubling). This allows the destination TTL to be reached in O(log N) time complexity instead of O(N), dramatically reducing the number of probe packets and time required while still enabling complete path discovery through retry mechanisms
Solution Approach 2:
The patent implements feedback mechanisms where the system monitors whether probe packets reach the destination and adjusts subsequent TTL values accordingly. When the destination is reached or exceeded, the system feeds back this information and retries with adjusted TTL values to ensure complete path information is captured
3Measurement precision
If multiple ports are used for probing, then network path can be traced accurately, but device complexity increases
Solution Approach 1:
The patent makes the probe packet system universal by implementing support for multiple protocols (ICMP, UDP, TCP) and multiple port numbers within a single traceroute implementation. This multi-functionality allows the same system to adapt to different network configurations and security policies without requiring separate specialized tools for each protocol type
Solution Approach 2:
The patent introduces dynamic protocol selection and port number adjustment based on network conditions and security policies. The system can dynamically switch between ICMP, UDP, and TCP protocols, and adjust port numbers adaptively, making the device more flexible and easier to operate in diverse network environments
Data Source
AI summary
Techniques for determining a destination Time-to-Live (TTL) value for a destination in a service path include sending a first trace packet having a TTL equal to an integer N; sending a subsequent trace packet having a TTL based on whether a response is received from the destination to the first trace packet; and repeating the steps until the destination TTL is determined. The various embodiments are adapted to perform the determining based on a binary search approach, thus optimizing the process for determining the destination TTL.