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I can't get any readings with my multimeter (it's probably blown up), and the board doesn't have any schematics. I've been searching the net for hours and can't find anything about it.
It's the white one with the CL2 above it. This photo is for reference only, on my board that component doesn't even have a description or symbol.
Putting things into context, the circuit in the picture is about Ethernet interface.
The component CL2 has a connection to Ethernet socket metal shell. Thus it must be the common mode capacitor between local groud and Ethernet ground.
Such a capacitor would typically be rated for maybe 1 to 2 kV and about 1 nF. The need for high voltage explains why the capacitor does not look like a standard SMD capacitor.
So, unless your multimeter can measure capacitors of roughly 1 nF in value, you won't get a reading. It might be blown but it would not prevent the device from working, it is an indication that if the capacitor is blown, there may have been a lightning strike and a lot more of the Ethernet interface has blown too.
Looks like an SMT (one-time) fuse, but I don't find the markings very useful. It's possible there are markings on the sides. Bel fuse photo from Digikey:
