Network only works with 10 Mpbs

Alfa Lutfi · Feb 12, 2017

It only happens when I'm using the Sandy/Ivy Bridge motherboard.

My network will only accept 10Mbps, instead of 100 Mbps or gigabit speed. If I do set to those higher speed, the network will be in a state of loop, it will keep refreshing and detect the network.

I did try out a cheap network card, but it does the same thing.

Oddly, when I plugged the same network cable to a laptop, tablet, and a newer Skylake platform, it does not have this issue, a stable 100Mbps. Even on the cheap network card that I bought which I hope that it solves the problem.

The cable is Cat6, attached to a TP-Link TL-SG1008D and connected to a TL-PA4010. My network provider speed is actually max out to 300 Mbps, so no problem over there.

bill001g · Feb 12, 2017

This is a physical issue with the cable likely. Some equipment can tolerate a cable that is slightly damaged more than others. Some cable you find are fake cables and have wire that is too thin or is copper clad aluminum rather than pure copper. This types of cables have lots of random issues because they do not meet the standards.

It is going to be fairly cheap to try another cable. If that does not work you have to consider damage to the port on the motherboard which is not something you can fix so you can only hope it is just a bad cable.

Alfa Lutfi · Feb 12, 2017

Thanks for replying but, I do own an ECS H67H2-M2 and Z77A-G45, both have the same problem. I tried every cable in the house too, a Cat5.

If the cable is the issue, I still don't understand why my Skylake, laptop, and tablet can run at 100Mbps.

bill001g :

bill001g · Feb 12, 2017

This is handled at the hardware level with the chips detecting voltages on certain pairs of wires. It is not a software thing really. This standard was defined before most pc even existed so it not like older chipset did not understand how to implement the negotiation of speeds.

It can be as simple as there is a little corrosion on one pin or a wire is just slightly loose. If you have tried multiple cable I don't know what to tell you.

This is such a basic thing there is nothing you can set or change to have much effect. You want to leave any setting in auto.

photonboy · Feb 12, 2017

I'm not sure the above answers make sense (I'm still thinking) because:

1) He tried the SAME CABLE (works fine on other PC)
2) He tried a different NETWORK CARD on the problematic PC (same issue)

So it doesn't appear to be a hardware issue.

photonboy · Feb 12, 2017

1) How did you TEST this?

2) You should test copying between two computers that BOTH are attached to the router via an ethernet cable (not both to the same switch or they bypass the router). As long as you can copy a large file well above 11MBps then you know Gigabit connection is working at that point.

*Time with an actual WATCH. For example, if it's a 600MB file and takes 10 seconds to copy between two computers the transfer speed is 60MBps which means Gigabit is working as 10/100 would max out at about 11MBps.

3) Also test the INTERNET but that only proves speed between the MODEM and your ISP. I don't get above 11MBps so this is useless to me. I only get 1.2MBps.

Are you sure you get 300Mbps? That seems pretty high.

(you say you got a "stable 100Mbps connection" but that doesn't really make sense. You need to actually TEST your connection speeds)

4) PROBLEM?
If it's a software issue you can try to DELETE the connection and try again. Under "network connections" but get the testing done first.

bill001g · Feb 12, 2017

It depends how picky you get on the definition of hardware. There are drivers loaded by the bios but this is a extremely well known process that has been around for years. It is extremely unlikely there is a bug in firmware for those chips.

Alfa Lutfi · Feb 12, 2017

I cannot set to auto-negotiation, I must set it to 10Mbps, if not, it will do the same thing, refresh, connect, disconnect.

bill001g :

Alfa Lutfi · Feb 12, 2017

The 300Mbps is the max that my network provider provides, I know it is for the wifi, but 100Mbps for wired.

However, the only time when I got a full 100Mbps is when I remove my graphics card.

photonboy :

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