Peter, the uRadMonitor never gets a DHCP lease, as it seems to be sending an invalid DHCP request packet, or at least it’s sending something that my network equipment doesn’t like. (See attached image on my initial post).

I have done some more testing with a separate SPI network module, the same as is installed in the uRadMonitor, which I can get working on my usual network hardware without issue, using standard example code to enable DHCP. This is pointing me more at a firmware bug on the monitor, rather than my network equipment or the network hardware in the uRadMonitor.

Using another router does work. Unfortunately though, in the long term, segregating a seperate segment of my network is not a solution.

This thread is to get other people to post packet captures from their network, so I can possibly work towards finding out where the problem lies. (IRL, I’m a network engineer) ;).