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
c4d14a67d1