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Sometime in the past month, The connection to my 2.5gb switch keeps getting stuck at 1gbps.
I have to go and unplug the network cable from the switch or my PC and plug it back in again to get a 2.5gb link back. Sometimes it takes multiple tries.
I have no idea why this is happening. I have tried updating the NIC drivers in Windows as it was using a old M$ driver from the dark ages.
I have tried setting the NIC to use 2.5Gb full duplex but that's not got it either. Just disabling the NIC in windows and enabling it again does not work. I have to physicly remove the cable.
Once it is back to a 2.5gb link the connection seems perfectly stable.
Any ideas what the issue might be?
The other devices connected to my switch all stay at 2.5gb.. but then again they dont get turned off at the end of my day, My PC does.
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Looks to me like the behaviour I would expect if your cable arrangement was a bit marginal for 2.5Gb/s, although that might not be the cause.
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You've probably tried this but here's a couple of elimination steps.
Step 1 is to swap the cable with another device but keep using the same switch port for this PC.
Then wait and see if the problem stays with the PC or now affects the device with that cable.
Step 2 step is to swap the switch port used by the PC with another device.
Then wait see whether the problem stays on the same switch port and affects another device, or remains with the PC.
If the problem remains with the PC then it is not the cable nor port, and It's possible that the NIC/driver does not properly handle the sleep / wake up cycles. After a reboot of the PC does it always come up at 2.5G without exception?
prlzx on Zen: FTTC (VDSL) at ~40Mbps / 10Mbps
with IP4/6 (no v6? - not true Internet)
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Rule 2 of comms applies : it's always the cable
 Comms is hard |
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After a reboot of the PC does it always come up at 2.5G without exception?
No, It will not come back with a reboot or when the PC has been off. I HAVE to re-plug the cable every time.
I cant swap the cable right now as the rest of the cables I use are only short ones and the one to my PC is 3 meters long.
Cables are not expensive so come payday I think Ill just have to grab a new CAT6e
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Has something enabled EEE on the switch? This was a big issue on the VM Hub 5 and dropped it's 2.5Gb port to 1Gb. The solution was to switch off EEE on the managed switch.
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Cat 6E isn't a thing. Cat 5e, Cat 6 or Cat 6A are all fine for 2.5G
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Out of interest does it matter what end of the cable you re-plug to get it back to 2.5G?
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Thats true, The cable says it is tho 
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Yes.
I have to unplug it from the switch and connect it to another port and it will go back to 2.5gb
If i then plug it back into the port it was in at 1gb it will now be 2.5gb.
If I unplug it from the PC end it makes no difference.
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What's the make and model of the switch? Is it a managed switch? Does it support EEE?
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If the cable is labelled with a fantasy spec / bandwidth then I would be tempted to blame the cable.
It is otherwise very strange for a host not to come back at the rated speed of the NIC following a cold reboot if the cable is really ok.
The devices on both ends make an assessment of whether a cable can sustain 2.5G, 1G, 100M and so there is really no point in trying to set manual speed/duplex for 1G or faster because instead of negotiating a usable rate you just get link dropouts and/or retries instead.
(yes I realise there are known corner cases for things like how BT historically configure ADVAs without auto negotiation and you end up with a fallback to 10M/half. and this is not that)
prlzx on Zen: FTTC (VDSL) at ~40Mbps / 10Mbps
with IP4/6 (no v6? - not true Internet)
Edited by prlzx (Mon 05-Aug-24 11:05:20)
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Have you checked that Energy Effiecient ethernet on the pc is not enabled ? My intel 1gbit nic is enabled but my realtek 2.5 isn't. The realtek has also an EEE speed setting too which the intel one hasn't
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My memory serves me wrong...
This is not the cable that listed its self at cat 6e. I found the order on Amazon. Had this since 2019.
https://www.amazon.co.uk/dp/B00YSFSLKO/ref=pe_318791...
The switch is this:
https://www.amazon.co.uk/dp/B09M2WFBP1?psc=1&ref=ppx...
I am using this router as my WiFi AP but its also on standby as a backup for my PFSENSE/Proxmox box if that goes tits up.
https://www.amazon.co.uk/dp/B0CP7S3117?psc=1&ref=ppx...
This has 2x 2.5gbps ports and one is spare at the moment. I might try connecting to that vs the switch and see if the problem follows. If it does then it's either the cable or the PC.
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This has 2x 2.5gbps ports and one is spare at the moment. I might try connecting to that vs the switch and see if the problem follows. If it does then it's either the cable or the PC.
Do this now, as that will sort out if its the pc settings or the cable...... You may find that its fine with that combination but I'd then try another shorter cable with the switch, as it maybe the cable being sensitive to the switch compared to the GL-MT6000. Personally i'd double check the nic settings in device manager as a matter of procedure to rule out that and it only takes a minute
My memory serves me wrong...
This is not the cable that listed its self at cat 6e. I found the order on Amazon. Had this since 2019.
https://www.amazon.co.uk/dp/B00YSFSLKO/ref=pe_318791...
on a side note the comments for that cable is hilarious
Edited by Taras (Tue 06-Aug-24 07:32:59)
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on a side note the comments for that cable is hilarious
As is the current price, £0.10p BUT postage is £3.98p...
Cheers!
Clive
Andrews & Arnold Home::1 FTTP Technicolor DGA0122 Cisco ATA191 for A&A VoIP together with a HUAWEI E5776 with O2 Data SIM
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I think there is high chance the problem is the quality of the cable, I've experienced the same in the past.
I've had good results with "Cable Matters" cables from Amazon running at 2.5G and 10G
Equivalent to your linked one is probably https://amzn.eu/d/eYtE20N but shorter the better.
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I paid £2.49 and free shipping as I had prime
The issue seems to have gone now I’m connected to the router vs the switch.
I will confirm tonight when I get home from work.
This switch and pc and cable never had this issue for the first month of using it.
But I’ll grab the suggested cable and see how that goes
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Just noticed that this is the same cable I bought to go from the switch to my other devices. Router pfsense etc I got a 5 pack of .9m cables 😁 and those have been working flawlessly
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Is your BIOS on the PC up to date?
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try "swap the cable to another from the same pack"
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Post deleted by Colinh58
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It's not the cable.
I found the issue and you would never guess what it was.
UEFI Network Stack.
I enabled this a few weeks back as I was messing with PXE booting from the network.
Seems I will have to enable it on a as needed basis!
How very odd.
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UEFI Network Stack.
I enabled this a few weeks back as I was messing with PXE booting from the network. Glad you found it but in hindsight we should have asked if you had made any recent changes.
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ok that is weird. Pxe boot in theory shouldn't mess with the lan speed, unless its set in bios - which in your case it is....... It may be worth submiting that as a bug to the mobo manufacture
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