Hmm.
An idea for sure, but if I recall correctly Duet with an attached SBC does not allow network commands?
That's the problem I ran into a few weeks back, anyways. 
According to AI the reason being:
If you're getting a "network command not allowed" error on your Duet SBC (Single Board Computer), it usually means you're trying to send a network-related G-code command while the Duet is not currently configured to operate in "SBC mode," where it directly handles network communication with a connected computer; check that your Duet is properly set up to work with an SBC and that the SD card is empty as the Duet needs to be running in SBC mode to execute network commands.
And I agree...the likelihood of getting your LAN Mgr. to allocate a fixed IP address in a EDU environment is slim at best.
Even fire-walled and sandboxed to infinity, the temptation for those college kiddos to setup servers using fixed IP's is too great to overlook.