Whenever my kitchen tube light or fan is turned off or on my Ethernet LAN disconnects. How could they interfere with the the Ethernet? My Laptop is connected only to LAN Ethernet cable
What could cause this to disconnect?
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Ethernet LAN wire coming from local internet provider
Your profile says you're in India. It also sounds like your ISP has an Ethernet wire that runs into your dwelling (I suspect this is an apartment). I further suspect they ran the cheaper Cat 5e inside the building.
Fluorescent lighting produces a fair amount of electromagnetic interference. My bet is that the Ethernet parallels either the light fixture or the electrical wiring in general (I could easily see the latter being done to save costs by cutting corners).
Unfortunately, since you didn't run the wiring yourself, there's no easy fixes here. If you had run them, I would make sure you keep the Ethernet away from the electrical. I would also run Cat 6, since it affords better shielding. Putting the wire inside conduit would also offer better shielding.
Presuming wifi, since you didn't say where the disconnect occurs... Sounds like they're producing radio noise when turned off -- not uncommon -- snd that your wifi drivers or hardware or xdrivers or applications are much worse than most at retrying after packets wdre garbled.
I've seen this before with leased modems from the broadband company. The modem lacks appropriate filters to keep out noises, or its existing filters aren't cutting it. Try relocating network hardware to different circuit, and/or replacing fan.