Forward Issue
In this case client has two default routers.
Issues
Routers forward the packet came to eth0 to eth0.
In this case, MR1 and MR2 forward echo reply from HA each other.
And client receive echo reply form HA 60 times in 1 second.
Because TTL of packet is 60.
Cause
I guess MAC address of Etherflame isn't set up well.
topology
Samples
multi.ned
network.xml
omnetpp.ini
CMakeLists.txt
Screenshot