Quite some time ago I changed my router to supply a static connection for the uRad monitor, but it obviously has not helped my particular unit.
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The problem at the top of this chain of notes was one of the unit having trouble recognizing that it had a valid PHY connection. So – quite a bit before the issue of DHCP comes up. I actually ran into this sort of problem with an earthquake sensor that I run here. Until I added the extra length of cable, there was all kind of noise on the earthquake signal. This only happened when it was connected to a gigabit switch rated for 100 meters of cable …