Access one microtik throught another.

Hi,

I want to connect my mikrotik RB912 (as slave. 192.168.50.3) to second mikrotik RB912 (as master. 192.168.50.1).
On slave mikrotik I have OpenWRT on metaRouter and as long as I am using Ethernet connection I have access to it.
I did this tutorial http://wiki.mikrotik.com/wiki/Connect_to_an_Available_Wireless_Network on mikrotik slave, disconnected Ethernet and I can’t ping mikrotik slave from my laptop.

My purpose is to can access mikrotik slave in my LAN area. But I want to be connected via master (it has access to the Internet). So slave has to be connected to master (AP) and I want to be allowed ping slave mikrotik.

I don’t know what should write here to help understand my problem so you can as about details.
On the screen is ‘station bridge’ but I have set ‘station’.
a.png

I add that in wind box I see that there is 192.168.50.3 (when Ethernet is disconnected) but I can’t connect to. Bu if I choose MAC connection I can access slave RB912. So the connection exist but I can’t ping it.
Here is a ping look at lose data:

ping 192.168.50.172
PING 192.168.50.172 (192.168.50.172) 56(84) bytes of data.
64 bytes from 192.168.50.172: icmp_seq=275 ttl=64 time=2.41 ms
64 bytes from 192.168.50.172: icmp_seq=276 ttl=64 time=1.87 ms
64 bytes from 192.168.50.172: icmp_seq=277 ttl=64 time=1.58 ms
64 bytes from 192.168.50.172: icmp_seq=278 ttl=64 time=6.70 ms
64 bytes from 192.168.50.172: icmp_seq=279 ttl=64 time=70.5 ms
64 bytes from 192.168.50.172: icmp_seq=387 ttl=64 time=1.98 ms
64 bytes from 192.168.50.172: icmp_seq=388 ttl=64 time=3.13 ms
64 bytes from 192.168.50.172: icmp_seq=389 ttl=64 time=1.61 ms
64 bytes from 192.168.50.172: icmp_seq=390 ttl=64 time=2.98 ms
64 bytes from 192.168.50.172: icmp_seq=391 ttl=64 time=1.59 ms
64 bytes from 192.168.50.172: icmp_seq=447 ttl=64 time=2.59 ms
64 bytes from 192.168.50.172: icmp_seq=448 ttl=64 time=1.62 ms
64 bytes from 192.168.50.172: icmp_seq=449 ttl=64 time=2.47 ms
64 bytes from 192.168.50.172: icmp_seq=450 ttl=64 time=1.81 ms
64 bytes from 192.168.50.172: icmp_seq=451 ttl=64 time=1.39 ms
^C
--- 192.168.50.172 ping statistics ---
457 packets transmitted, 15 received, 96% packet loss, time 456022ms
rtt min/avg/max/mdev = 1.391/6.955/70.537/17.039 ms