v7.2.3 [stable] ARP ping failed

I’m getting a problem in CCR 2116 OS v7.2.3 [stable]. I’m confuse!, is that OS bug?
Normal ping is OK, but when I’m trying to ARP ping that time responded status is “ping failed”.
Problem Screenshot is attached.
Capture.PNG
Please help me to give me a proper solution.

Already under discussion.