Ping Problems between RB and router configured as Switch

Hi Everyone!

I’m dealing with a very strange problem.
I have a network with an Routeboard and one router configured as switch connected in RB.

The devices conected by wireless in router have internet, all right. I can ping this router from other devices in network, but i can’t ping this device by inside RB! (I’m using Winbox->Tools ->Ping).
When i use IPScan, the device appears in list.

I need to ping device via RB, to monitor this router from outside.

Thanks a lot!

Please share your configuration