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I have a 100 Mbit/s router and all devices until recently were connected to it, so I was only getting 100 Mbit/s connections which makes sense.

Now I've disconnected all my devices from the router, added a 1 Gbit/s switch, connected the router and switch, and connected all other devices to that switch. On the switch I have two computers with 1 Gbit/s adapters and two connections which are 100 Mbit/s, one goes to a second router which acts like a hot spot. Why am I getting a 100 Mbit/s connection between computers with 1 Gbit/s adapters?

Shouldn't the router now handle 1 Gbit/s between the two? Is it possible that the switch is detecting the 100 Mbit/s router connected to it and as such throttling the connection?

Hardware:

  • Router #1: Asus RT-N12+
  • Router #2: TP-Link TL-WR1043ND
  • Switch #1: Linksys SE2500
  • Both PCs: Intel Gigabit Ethernet Adapter

I've also checked all cables. They are Cat 5e.

To better explain my situation here is my setup:

Enter image description here

SOLUTION: The problem was in connectors where not all pins were pushed all the way in.

erikvimz
  • 143

2 Answers2

7

The problem is likely in your cables. 1000BASE-T (gigabit ethernet on UTP) requires all four pairs of wires in the cable be connected correctly. If they are not, auto-negotiation will cause the interface to step down to 100BASE-TX (fast ethernet on UTP).

If even one of the two cables connecting the two 1000BASE-T PCs is not correct, then the two PCs will only be able to communicate with each other at 100 Mbps.

Ron Maupin
  • 3,463
1

I had a similar problem. My issue was that the Cat 6 cable from the RJ45 wall socket to my PC was too close to some power supplies. As soon as I moved the power supplies away Windows negotiated 1 Gbit/s speeds with no issue.

I spent hours trying to "repair" my drivers and configuration thinking it was a software issue.

Peter Mortensen
  • 12,326
Kevin
  • 186