Traffic Generator

Hello, I would test my Mikrotik OSPF Network, I’m looking for a software that generate traffic for test my two wireless link.
I’m looking for a software that generate different type of packets with different src/dst-addresses. Anyone can help me?
How OSPF algorithm balance the traffic when there are two links with the same cost?
Many thanks.

OSPF installs ECMP route:
http://wiki.mikrotik.com/wiki/Route#Multipath_.28ECMP.29_routes

You can use bandwidth-test on the router to generate traffic.