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Why my link speed limited to 100mbps ?
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soonwai
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 Aug 1 2018, 01:17 AM
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QUOTE(popopi @ Aug 1 2018, 12:45 AM) So this speed issue... confirm inside properties that ur Ethernet is set to Auto Nego confirm ur DIR-850L settings for LAN is 1Gbps Lan cable does not really matter here... unless u going more then 10Gbps. You can't set the speed of the LAN ethernet ports in the DIR-850L. This post has been edited by soonwai: Aug 1 2018, 01:27 AM |
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soonwai
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Aug 1 2018, 01:25 AM
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QUOTE(ootik123 @ Aug 1 2018, 12:40 AM) I dont know why just stuck at 100mbps even though i used cat5e cable which support 1 gbit and a dlink DIR- 850L router. My motherboard LAN port support 1 gbit. (Asus H110M-D). Anyone pro know how to fix it ? Thx Can you take a picture of both ends of the cable so we can see that all 8 wires inside the cable are crimped correctly. We need to see the colours clearly. Rule out the cable first, as johnlai said, it may be the cause of the problem which I find to be the true in many cases. Do you have another cable to test? Also try cleaning the contacts on the cable, PC's ethernet port and router ethernet ports where necessary. It may also be an auto-negotiation incompatibility between the DIR-850L and your motherboard. For this you can try: 1. turning off auto-neg and force the PC to 1Gbps. 2. Updating/downgrading NIC drivers. 3. Updating/downgrading router firmware. But try sorting out the cable first. This post has been edited by soonwai: Aug 1 2018, 01:26 AM |
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soonwai
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Aug 1 2018, 01:33 AM
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QUOTE(popopi @ Aug 1 2018, 01:27 AM) Yes, force to 1Gbps will be a good idea... just make sure all 8 wires are the same ordering... if there are 4 wires swapped.. it should auto set as well.. so called cross cable/straight cable... Ethernet nowdays should able to handle auto detect cross or straight. Just to clarify, "force to 1Gbps will be a good idea" only if it's a negotiation problem. If it's a cable problem, it'll make things worse. It might link at 1Gbps but the ports will flap (go on/off) or you'll get lotsa packet loss and low speed. This post has been edited by soonwai: Aug 1 2018, 01:34 AM |
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soonwai
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Aug 1 2018, 02:16 PM
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QUOTE(ootik123 @ Aug 1 2018, 02:08 PM) Erm actually i slept early yesterday and now i just starting to fix it 😁 thx anywhere for ur help Take the path of least resistance, check the cable first. Use another one and see what happens. |
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soonwai
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Aug 1 2018, 03:51 PM
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QUOTE(ootik123 @ Aug 1 2018, 03:01 PM) I used the cat5e from my dlink router box and it achieved 1 gbps but the cable is very short just about 1 meter I think more or less confirms that it's a cable problem. 1m, 5m, 10m shouldn't make any difference even for cheap cables. It could be a reason other than the quality, maybe the heads were crimped wrongly, or there's a break or a short somewhere along the cable. Where did that problematic cable come from? This post has been edited by soonwai: Aug 1 2018, 03:52 PM |
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soonwai
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Aug 2 2018, 12:48 PM
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QUOTE(thewan @ Aug 2 2018, 12:14 PM) Erm yes it is. You just haven't found a cable that affects your realtek yet. I have referred my problem to snb forums and the replies there all say the same thing, Realtek doesn't like the cable I am using. My entire house is now Realtek free as I've upgraded those two older PCs and the entire house is now gigagbit. I'm not gonna buy new wires and rewire the whole house again when other non Realtek LANs works fine. Before you ask yes I tested transfer speeds between the non Realtek LANs, both normal network copy/paste and iperf and they show gigabit speeds, up to ~90MBps. So there is nothing wrong with my cables. My conclusion is, if you only have one problem device/cable, then try a different cable. But in my case I have already wired the entire house, and and every other device works fine (yes even the connection between my router and my unifi modem is gigabit) so I didn't change the cable. I just made sure the next time I replace/upgrade PCs I don't go for Realteks. I have nothing against them. Its just in my case, which admittedly while rare it does happen based on my research, I decided to just move away from Realtek so that I have less headache to deal with. That's interesting. What brand cables are you using? Strange that a network chipset can be affected by the brand of cables. What affects it? Aluminium, copper, resistance, impedance, conductance? My 2 main computers are Realteks; Zotac Z77ITX, cheapo USB3 GBe for my MacBook. The MacBook is connected to a router using a Mediatek switch chip and the PC is connected to one using a Artheros switch chip. This just made me realised that I don't know the brand of cables used in my house. Or I had forgotten. I must have specified something to the contractor. Must go check. |
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soonwai
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Aug 2 2018, 01:50 PM
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QUOTE(System Error Message @ Aug 2 2018, 01:08 PM) brand does not matter, the quality does. A lot of cables call themselves cat5e when they hare only cat5a, and so on. A cat 7 cable was found to be cat5e. If most people use gigabit, they wont realise the difference until they start getting errors and interference. Yes but it might be difficult for thewan to answer if I asked “What quality cables are you using?” |
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soonwai
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Aug 2 2018, 02:30 PM
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QUOTE(ootik123 @ Aug 2 2018, 02:12 PM) I think probably is aluminium which is not good in performance compare to copper wire. I dont think i can figure out the brand , i remember this cable just ordered almost 3 years ago from Taobao. Maybe i was being scammed 😧. I just know the quality of the cable is very cheap la , it just simply aluminium fiber. Sokay lah if it works. For short distance, should be ok. My cousin once bought a length of cat5e from Lazada local seller. It only had 3.5 pairs of wires. It’s weird, I think the brown/white was missing. |
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