If you can manage to get the DHCP / SSDP part turned off at each of the servers (this might be as simple as turning off "serve audio to this receiver"), then --
[[hey, can you do that? Does the stock server allow you to ignore any given receiver? Or is the checkbox just for serving music in general? ]]
...anyway, what I was going to suggest is turning "off" the servers, such that they won't respond to SSDP / DHCP requests, but then see if they'll still respond on the HTTP port to normal requests (I'd bet they would). If so, then you could:
* Set up a DHCP server to assign static IP addresses to each receiver
* Modify Jeff Mock's SSDP.pl script to give a different server address to each receiver, based on the receiver's IP address
* Install that perl script somewhere and get it running as a daemon or service
* Cross fingers
I dunno, does anyone think this might work? I'm considering something similar so I can test JReceiver stuff with one receiver, while using the "established and functional" JReceiver server for the two other receivers in the house. As it is, when I play with the code, my wife gets annoyed 'cause the other Rios break.