Just to be sure, the helper ip-address is going to be a local broadcast address for the target network, correct?
So if my server that initiates the WoL is on 192.168.190.0/24 network and the target network is 192.168.192.0/24,
my helper ip-address will be 192.168.192.255 and it will be configured on the 192.168.190.0/24 interface.
Yes. If the server that will issue the WOL packets is in the 192.168.190.0 network then the helper-address commands will be configured on the the 192.168.190.0 interface and the helper-address would be 192,168.192.255.
I just wonder, aren't there WOL Servers outside, that already create a directed broadcast paket? If this is the case, the ip helper is not needed. Creating all the helpers in an enterprise network would be a mess.