Vxworks Ethernet Driver For Mac 4,2/5 3389 reviews
Vxworks Socket
To those few who might stumble this way. It was the horrible 'hypothesis 4'!
Vxworks Software
It turns out that in order for etherOutputHookAdd to work correctly, it is incumbent on the NIC device driver writer to include a call to the function pointed to by etherOutputHookRtn. All etherOutputHookAdd does is add your proffered packet handler to a list, so that when a NIC driver calls etherOutputHookRtn, you get a copy of what's being transmitted.
Sadly, there are many drivers where for whatever reason, this was simply not done. So in cases such as this one, there are only two courses of action. find a patch for your driver, or patch it yourself.
change tactics entirely, e.g., try using etherInputHookAdd on the other side.