Function cap

network_diagnostics.py:1639–1646

(pat, cast=float)

           '--script-args', f'broadcast-dhcp-discover.timeout={int(timeout_s)}']
    if interface and _valid_iface(interface):
        cmd += ['-e', interface]
    res = _run(cmd, timeout=int(timeout_s) + 25)
    if res['rc'] == 127:
        return [], 'nmap not found'
    return _parse_dhcp_discover(res['out']), None


def _parse_dhcp_capture(output):
    """Parse verbose `tcpdump` DHCP output into client-request stats:
    (requests, distinct_client_macs). Counts DISCOVER/REQUEST (client→server)
    and the distinct BOOTP client hardware addresses (chaddr) behind them —