Echo reply cannot retern

According to Multi-Homing Issues in Bi-directional Tunneling(draft-ng-nemo-multihoming-issues-01),
there are 8 cases of multi-homing. (x, y, z) = (MR, HA, network prefix) = 2 x 2 x 2 = 8 cases.

This case is (1, 0, 0). It means "two MRs, one HA ,one network prefix". The
In this case client has two default routers.

Issues

Echo reply cannot reach client, if the router does not know the way which the echo request went.
Because, echo request is from eth0(2001:200:0:abcd:260:97ff:0:e0) and MR2 doesn't know
eth0. MR2 only knows eth1(2001:200:0:abcd:260:97ff:0:e1).
Must echo request and echo reply go trough the same way??



topology



Samples

multi.ned
network.xml
omnetpp.ini
CMakeLists.txt

Screenshot