access-list 180 permit udp host 10.1.20.64 any
access-list 180 permit udp host 10.1.20.65 any
ip address 10.1.0.10 255.255.0.0
ip helper-address 10.2.255.255
ip address 10.2.0.10 255.255.0.0
ip directed-broadcast 180
Note that the helper address sends the WOL broadcast to all destination subnets that are specified there (in our case to the 10.2.0.0/16 subnet) but you control what lands up on the destination VLAN with the directed broadcast command and an acl. It works if you use a supernet in the helper address command to cover all your destination networks.