Ros2router config setup port for connection-addresses and listening-addresses

[thongtd]

Last week, my ros2 service send successful request but cannot receive any respone !
Then i see example of ddsrouter, in husarnet it is ros2router
I see husarnet ros2router config setup same port for connection-addresses and listening-addresses.
=> With similar config i done with problem, my service work perfectly!
But i still confuse, document formal of eprosima
set up 2 port difference for connection and listening in this config ? why they do that, why i cannot use this way

[thongtd]

here is eprosima configuration