After reading FAQs I thought It could be related to this site (ServerFault) but got downvoted and put on hold.

Because it's R&D, it falls out of the "production system" requirement. But it's a problem I ran across for my job, using solely existing building blocks (iproute2 & linux 3.10).

My question is (was): https://serverfault.com/questions/547361/macvlan-based-interface-pings-from-host-but-not-from-namespace/547624