Modem, router, some Cat5 runs, and my beloved, never-failed-me C4 wiped out. Modem & router replaced, will tackle HE replacement soon with spare C4. This is the 2nd cable modem lost to lightning in 3 years, but the first time it has gone through the ethernet. (TP-link network switch still test Ok so far.) I do not have any POE but was looking at something like this Ethernet Surge Protector
I already have a 75 Ohm Lightning Surge Protector installed where the coax enters the distribution cabinet in the garage --obviously not doing a great job, but I could put a 2nd one immediately upstream of the cable modem.