Developed a feature for the yuwata/systemd repository that enables interface-scoped name lookups in nss-resolve, enhancing DNS resolution reliability in multi-NIC environments. The work introduced the SYSTEMD_NSS_RESOLVE_INTERFACE environment variable, allowing name resolution to be constrained to a specific network interface by passing the interface index to the lookup process. This approach improves captive portal handling and reduces cross-interface DNS leakage while maintaining existing Name Service Switch behavior. The implementation was completed using C, leveraging skills in network and system programming. No major bugs were recorded during this period, reflecting a focused and well-contained engineering effort on feature delivery.