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My ISP tech asks to come in my house because my setup affects their network… legit or not ?

So I got a call this morning because a tech guy wants to come in my house to check my network setup (I’m using Cable Internet). He says I’m affecting the neighborhood’s network somehow.

I’m an IT Tech and a web dev. I never heard such a thing, especially since I use THEIR modem, plugged in an Archer C7 router There’s only one ethernet cable used for a physical PC and a Linksys Powerline adapter plugged into the router, the rest is all Wi-Fi. The setup couldn’t be more simple.

Is it legit? What could be causing issues ?

Edit: I should rephrase: It’s legit, because it’s the real ISP number and everything… I’m just confused as to how I can be the cause of that kind of problem… I can’t create a loop in their VLANs or anything (at least, not the way I’m setupped).

EDIT2: Turns out the coax was the issue. We moved it about 2 inches, tightened the connector/coupler and it fixed the problem (I also gained ~10% performance on various speed tests).

OTDSadmin

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