====== hostname resolution ======

If OpenWRT is used as AP it doesn't know host names and show connected WIFi stations as ''?''.
Possible workarounds:
  * add to ''/etc/ethers''
  * using UCI
    * luci: add DHCP configuration:
      * AP only - DHCP is not used - ''Ignore interface'' checkbox is set on ''LAN'' interface
      * Network --> DHCP and DNS
        * Static Leases tab
          * add hostname with MAC address, but without IPv4 address - choose ''ignore''
    * uci cli:<code>
uci add dhcp host
uci set dhcp.@host[-1].name='my-pc'
uci add_list dhcp.@host[-1].mac='28:AD:18:D8:81:F2'
uci set dhcp.@host[-1].ip='ignore'
</code>