Dude, I suggest you download an arp firewall to see if anyone attacks you.

If it shows that no one is attacking you, you'd better install one.

Jusheng network management cracked it. Look who took a lot of traffic in your building IP.

Or manually ping the external network.

Then use ARP -A a.

See if there are one or two webmasters. You can add more specific questions. I'll help you find a way.