Worked on the apache/nuttx repository to enhance IPv6 networking by implementing a global address classification feature and improving robustness in network interface address retrieval. Developed a new macro in C within netinet/in.h to accurately identify global IPv6 addresses, excluding multicast, link-local, loopback, and unspecified types, thereby refining address classification logic. Addressed a Coverity-reported defect in getifaddrs by introducing defensive programming practices, such as null checks and validation of memory allocations, to prevent potential runtime errors. These contributions improved the reliability and maintainability of the network stack, leveraging skills in C programming, macro design, and static analysis tools.