Port blocking on the switch: “you have a flood here”, how is it?

Question

Network administration

Friends, faced with mysticism.
SPB, home internet "bee" company. Patch cord directly to the network card, Internet access via L2TP VPN.
3 days ago, the "unidentified network" began to fall out, stopped receiving packets and the IP address from the provider's switch. A technician came, fixes the break, changed the patch cord from the apartments to the basement. It didn’t help, but after 30 minutes of heart-to-heart talk with the technician, the IP address from the switch arrived. Hooray.

The same evening, "the network cable is not connected" already flew out. I call support, they say "tomorrow morning we change the switch to a new one, you are not the only one with problems." They changed the switch, sat for 3 hours looking at YouTube - again the "network cable is not connected" flew out.

The next day the technician came (different). There is no break, the cables are intact, but he found that I have a flood block on the switch port. I removed the lock, 2 hours of work on the Internet, along the way I checked everything again: all the ports are closed unnecessary, there are no viruses, everything is clean, no network downloads, traffic, broadcasts and other things, it’s clean like a baby, and the port regularly cuts a ban and you have to call engineers to be unblocked.

Moreover, different engineers see different things there and say: either I have two poppy addresses on the port, which is impossible, but now I had a flood, my computer is trying to interrogate computers in the LAN of the switch ... They

can’t help, I’m already muzzled. How to fix it? Can a defective patch cord generate fake poppies? could the network card burn out? but not completely.

Answer 1

Miracles do not happen - well, with technology, at least.
Take a router, put it in the gap between the wire and the computer. Take a router so that you can see the traffic. And look at the router - is it true that the flood and what kind of nafig. If it's just meaningless garbage or constant repetitions, there is a possibility that the fluffy animal has gnawed through the card. If intelligent scanning and searching is a virus.

Answer 2

Two options - either viruses-kvartiruses, or a broken card.
Solutions - go to the basement computer store and take a D-Link plug there for 200 rubles

Answer 3

A hundred times we had such a problem when I worked in the provider.
There were two poppies on the port, when the subscriber does not poke the cable into the Wan port, but into the LAN. But this is not your case.
The second is when the cable from the switch was thrown through the most asshole route, and there are so many pickups on the cable that the switch port starts to fail. It used to get to the point that all subscribers on the switch then glitches begin. Well, we used shitty DLinks for example. It was also such that you poke a patch from the port, but the port does not fall, and besides, some kind of traffic runs on it, poppies arrive.
I remember we had a switch on the shelf, it was a pity for me to throw it away, because it normally got on our nerves like that - you can just plug it into the outlet without connecting a single cable to it, but it stands - it blinks with lights, shows active activity on the ports , in which nothing is stuck. And you look through the console - and there a whole mountain of poppies flies, either on uplinks or on access ports.