Thanks for you response!
We want to use Npath for performance issues (trying to maximize throughput).
I tried "ifconfig lo -arp" (Linux) and I'm still able to ping the loopback interface from outside.
Related to outbound traffic, if you see the route table:
Destination Gateway Genmask Flags Metric Ref Use Iface
default 10.233.203.129 0.0.0.0 UG 0 0 0 eth0
10.233.203.0 * 255.255.255.0 U 0 0 0 eth0
link-local * 255.255.0.0 U 1002 0 0 eth0
Loopback interface is listening the request (because of the same IP address on LB) and I don't understand the flow of response... goes trough default gateway? because client (10.233.203.222 is on the same network than node)...
Thanks!