Function _tshark_fields

network_diagnostics.py:1524–1528

(path, display_filter, fields, timeout=120)

        'source': (f'arp-scan sweep on {scan_iface}' if scanned
                   else 'neighbour table (all interfaces)'),
        'oui_db': bool(len(_load_oui_db()) > len(_MAC_VENDOR_SEED)),
        'reasons': reasons,
    }


# --------------------------------------------------------------------------
# DHCP Guardian — DHCP-snooping-style monitor (detection-only).
#