I have a measurement device (an Agilent frequency counter) that I want to communicate with directly via it's LAN interface. However, my Ubuntu 20.04 laptop does not seem to want to establish a connection. I'm afraid there is some basic networking concept that I am not applying.
What I've tried: I've tested the device's LAN connection with a couple Windows PC's, and they connected (nearly) automatically. Curiously, when connected to my Ubuntu machine, the device still self-reports a fully functional LAN connection, and even displays its DHCP-assigned IP address. However, my laptop's wired network status oscillates between off and "Connecting", but never connects. Pinging the device's IP results in 100% loss. Yet more curiously, I am able to successfully connect to the device through a Windows VM on my Ubuntu machine.
My only lead is that the
ip route show line for the device's network prefix is:
169.254.0.0/16 dev wlp0s20f3 scope link metric 1000
where I would expect the ethernet device here, not the wlan.
Any pointers are very appreciated, as are resources related to basic networking that would help me here.