I'm not sure what is going on, but one machine in my home can't connect to my network as of 3 days ago. Due to short cables, I have the machine connected to a hub, which connects to a switch and from there, to my router.
Initially, I thought my 5 port switch was going bad, so I swapped it with a 8 port I had on the side. When that produced the same problem, I swapped it out for a 24 port switch. The 24 port switch worked with the machine, but only in a certain port. I plugged my laptop into random ports and they all worked fine, but plugging the hub in those same ports didn't work. It's the same issue with the 5 and 8 port switches.
Next up was the hub. Plugging the hub into the router (after disconnecting another machine) worked fine with the hub and the same occurred when plugging it into one specific port on the 24 port switch. I noticed that a ton of traffic was being sent through the switches at one point, but it hasn't occurred again.
I checked to see if having IPv6 enabled on the disconnected machine was the cause of the traffic (as it has been on another desktop), but it wasn't enabled to begin with.
Furthermore, when the hub's port lights go on, it isn't always lit on whatever switch it is plugged into. The connection doesn't always work when lit either. The hub also exhibits the same selective port issue as the switches.
What's causing this selective port operation, but allowing it to work when connected to the router when behind the hub or not?
Tl;dr:
Machine can't connect to network through switches anymore. Ports seem to have a mind of their own and may or may not work for an unknown reason.
EDIT: Also tested multiple cables, but I haven't tried my laptop on the other end of the hub, yet.
Don't use a hub, they aren't Duplex. Having more than one computer on a hub can make it seem that like the connection is dropping in and out, when it's just letting one computer in at a time.
There is only one machine on it. I'm only using it until I can get a longer cable.
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