Ok guys, I've solved my problem, but If I run the ettercap then my network connection is killed for everyone without pineapple(checked by network tools).
I guess, it's some bug with that because I also have problem with this.
That's command which I paste into ettercap:
ettercap -i br-lan -M arp:remote 172.16.42.214
and It showed me
ettercap is not running...
Firmware 1.0.4 ;)