I have a problem that I cannot seem to resolve. I have two hosts M and N. A container in host M can ping the gateway, its host and all containers in Host N but cannot ping any co-hosted container in host M. The same with containers in host N that can ping all containers in host M but cannot ping any of its co-hosted containers. I have verified that they all have unique hardware address.
My hosts run on ubuntu 14.04 but all containers run on ubuntu 12.04. I had to use 12.04 to accommodate Ambari from Horton Works that does not yet support 14.04.
Network - > Bridge br0 (I have 2 Network adapters)
auto lo iface lo inet loopback
iface p130p1 inet static
address 192.168.1.9 netmask 255.255.255.0
Second Adapter Bridge
iface eth0 inet manual
iface br0 inet dhcp