network device testing?? ensuring that a firewall/filter/shaper/whatever can handle the number of connections you need it to support? it's a stretch.

one might be able to put the interface in promiscuous mode and process the packets without having to actually place IPs on the interface (is there an OS that would hold a class B's worth of addresses on an interface?)

about the same on the sending side. craft your packets, change the dest IP field, recalc checksums and shove it out the interface.

but i doubt opee has a good reason or is using the right tools. or enough bandwidth...