I got WOL working by permanently editing the GRUB command line. After editing it looks like this:
kernel /zImage ihd_num=0 netif_num=4 syno_hw_version=DS3612xs sn=xxxxxxxxxx mac1:xx:xx:xx:xx:xx:xx vid=0x0EA0 pid=0x2168 loglevel=0 vga=0x305 rmmod=r8169 insmod=r8168
It's working!!!
Thank you very much for your help!! You are great my friend!