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The owner asked to see the vendor of each MAC where the IEEE registry can be fetched, and never to depend on it. internal/oui downloads MA-L, MA-M and MA-S weekly through the outbound allow-list (timeouts, a size cap and a row-count sanity check, so a truncated or wrong download keeps the previous file), stores one checksummed, atomically written file in <data-dir>/oui that nmon backup includes, and looks MACs up by the longest prefix. A missing registry only leaves the vendor empty. `nmon oui import DIR|FILE` loads the CSVs offline, and the Ansible role can ship them next to the MIB sidecar. internal/hostaddr parses the MAC, prefix, IP and CIDR forms the lookup accepts and classifies a MAC as global, local or multicast. config gains the l2 and oui sections (validated here; the L2 job that reads l2 follows). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01T4PdJUPrakM8fHvN8jYv2x