Hallo Swallen
I am not sure how familiar you are with WOL.
But WOL is a very old technology, and sadly many things come into play when troubleshooting on WOL.
First off, i would start by troubleshooting with same machine, the reason for this is you know that it's possible with this machine (on some machines, it is not only needed to enable in BIOS, but also in windows, hence what i am speaking of).
And EVERYTME you try out the machine it is important to "shutdown" the client properly, on most clients WOL isn't possible when you have created an unexpected shutdown of the client.
Your old 6.9 installation can be configured in such a way that you have a "WOL Proxy" placed on the subnet your trying to reach, and then everytime you send out a WOL to that subnet, it actually comes from this client, the reason for having this is that WOL is a broadcast based technology and cannot traverse VLAN unless it is configured to do so.
For testing purposes you could download fx. mc-wol to test if WOL does in fact work from your NS
http://www.matcode.com/wol.htm
It can be downloaded from here.
If you find that it isn't working and you simply cannot get it to function, here's a guide on how to setup ip broadcast forwarding up on a cisco based network.
http://www.cisco.com/en/US/products/hw/switches/ps5023/products_configuration_example09186a008084b55c.shtml
So to sum up, the reason you cannot get it to function might be so simple that you have a proxy configured in you DS environment, and that one is actually handling the WOL from your DS, without your knowledge of it. :)
Hope this help in clerifying things a bit for ya, and helps in your further troubleshooting of the problem, if you have other questions, don't hesitate on asking them.
Kind Regard
Morten Leth