Cannot see Netboot volumes

I configured my brand new XServe to serve Netboot diskless images. I installed the client computer, made my image and published it on the server. Up to this point everything works fine.
When I moved the client computer to it's normal position, suddenly it does not see the network volumes when I change the startup disk. It can however connect to the server perfectly fine once it's booted from the local HD.
I also tried the "Netboot across subnet" trick on Bombich Software, but it still doesn't work : the computer hangs at the flashing globe.
When I connect the client computer on the same switch as the server, it works and I can choose the netboot volumes in the Startup disk utility.
As far as I can see, the only difference between those two situations is the network connectivity, but since everything else beside netboot seems to work fine at both places, I wonder what is broken.
*My question: What exactly needs to be allowed on the network level to let Netboot functions properly (either by automatic discovery or by hard-coded address across subnets)?*
Thanks,
Jerome Tremblay
LaCIM

When you re-install you boot while holding down the 'c' key. Then I would go to the menu and select Disk Utilities. See if your drive shows up.

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[email protected]

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[email protected]

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[email protected]
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