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1000Mbps Full Duplex Devices keep getting reduced to 100Mbps full duplex speeds on wired Ethernet.
I have bent over backwards trying to diagnose this issue, my BGW320-500 nearly every day now despite removing, replacing, isolating and diagnosing every device on the wired portion of the Router continuously reduces my network from Gigabit to 100Megabit speeds. The result of this is, my NVR stops working in HD, my 2 PC's cannot use Gigabit speeds they are restricted to 100MBit.
If i restart the BGW320 everything goes back to normal for about 24 hours, then the next day......... back to 100MBit.
I have 1 switch that breaks down LAN Port 1 to a TPLink 8 port gigabit switch, i have replaced that with a Linksys Gigabit 8 port switch but the same thing continues to occur. Something at the router continuously reduces my LAN Speeds to 1/10th of what I am paying for.
I have isolated multiple wired devices, 2 printers ( both run in Gigabit Ethernet ), my NVR which then cuts off my remote access to the NVR Feeds, i have removed each PC and over the last 7-10 days every day now, i find my LAN Speeds are STILL being cut back to 100MBit.
Do I need to have my BGW-320 replaced?
Additional info, i do have a Roku on Port 4 which is 100Mbit itself, but this should not be affecting Port 1, as Port 1 has its own settings. Port 3 is a XBox Series S, which is gigabit, and has never had a problem with reducing to 100MBit. Port 2 runs to a Samsung Smart TV and has no issues.
Additional things done - IPv6 LAN - disabled
Port 1 is forced to 1G Full Duplex mode - Router seems to ignore this and still cuts back Port 1 to 100MBit.
Ethernet Cables - Checked for sharp bends, nicks and/or cuts in insulation - none. No extreme RFI/EMI running near Ethernet or Hi-Volt sources running parallel to them.
PC/Printer/NVR Settings - all show 1000 Full Duplex as selected mode.
Restarted Modem using power down for 60 seconds by power plug - temporary fix
Any additional info or help would be appreciated.
JMcCloud
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23 Messages
3 months ago
I had this issue before - https://forums.att.com/conversations/att-fiber-equipment/att-bgw320500-keeps-cycling-network-speed-to-100mbit-on-a-1000mbit-lan/639283505bc9827e1467ec26?commentId=6392a2da42ba910b5c75ea1a
eventually the router stopped with the network issues which is why i never replied, but its now happening again and this time its happening with much more frequent occurrence ( nearly every 24 hours )
to @JefferMC the client devices show 1000 Full Duplex, but the Router will say its in 100 Full Duplex Mode - the LAN Port Lights concur as being Yellow, instead of Green on the Link State and client devices are unable to go past 100Mbit in speed tests or any other type of network traffic.
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JefferMC
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33.5K Messages
3 months ago
Can I get both of you to please confirm the firmware version and the manufacturer code (-500 or -505) on your Gateways? If I can get 3-4 current reports on current firmware, then I will attempt to get some interest in the issue.
BTW, some people have corrected this by installing a new cable. If you've tried two cables that are certified for Cat5e or above, and are not more than 2 or 3 meters long, that's all I'm asking for.
(edited)
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JMcCloud
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3 months ago
I also know that both of my PC's have dual NIC's
On the most used PC, one of them is a Intel i219-v Gigabit the other is a Intel i211-AT nic. I did some looking into them, and the 219-v seems to be some kind of low power port over the 211-AT which is a full featured port.
Would this possibly be the reason why? if yes, then why would it also drag down the entire port at the router to 100MBit if the connection is to a switch first?
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JefferMC
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33.5K Messages
3 months ago
The switch should handle any such issues. A low-signal issue with a port at one port of a switch shouldn't affect any other switch ports.
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JMcCloud
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23 Messages
3 months ago
Manufacturer HUMAX
Model Number BGW320-500
Serial Number D93LA1HV****** ( redacted for security )
Software Version 4.24.6
MAC Address ec:c3:02:2e:3c:50
First Use Date 2021/08/05 20:16:30
Time Since Last Reboot 00:01:04:56
Current Date/Time 2023-09-23T08:25:24
Hardware Version 02001F00460050
Legal Disclaimer Open Source Licenses
^ ^ is this what you are looking for?
And its not possible to run a cable shorter than 3m to the wired PC's. At best guess the cable leaving port 1 has to travel down one floor, and is approximately about 20-25 foot total length, well within the confines of gigabit specs for Cat 6 as they are Cat 6 Cables to the switch, and from the switch to the PC's also Cat 6. distance from switch to PC's is 3 feet. But its absolutely unavoidable from the BGW itself to the switch. luckily we are able to have such a short distance as the ATT installer ran the cable through the wall, down the floor and the room that contains the Switch, is almost directly under where the BGW sits. and also pretty much next to the Fiber Tap coming into the wall itself.
(edited)
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JefferMC
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33.5K Messages
3 months ago
So, the cable between the Gateway and the switch is long (because it is running between floors/rooms). Is it a single manufactured cable from end to end, or are there some in-place terminated cables here?
(edited)
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JMcCloud
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3 months ago
exactly, so i am confused as to why port 1 at the router becomes 100Mbit, the others stay at 1000Mbit, and everything down cable from Port 1 despite being behind a switch also becomes 100Mbit. Even after replacing the switch with another one, the router continues to downgrade that connection. i had a buddy of mine test the cables... all 6 of them.
Port 1 to Switch Cable = No Faults, and tested to 10Gbit.
Switch to PC 1 Cable = No Faults, tested to 10Gbit
Switch to PC 2 Cable = No Faults, 10Gbit
Switch to Printer 1 = No Faults 10Gbit
Switch to Printer 2 = No Faults 10Gbit
Switch to NVR = No Faults 10GBit
so I am at a absolute loss here as to why this is occurring.
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JMcCloud
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23 Messages
3 months ago
as far as i know, its a single piece cable
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JMcCloud
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3 months ago
also @JefferMC you mentioned "both of you" ? I am the same person from the other linked topic. i had this issue before, it self resolved itself, but its started doing it again.
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JefferMC
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33.5K Messages
3 months ago
Oh... sorry. I thought there were two posters. Okay, well, I need to find at least 3 people experiencing this so I can raise a ruckus. I thought I had two here.
If you got this result with a cable tester:
then that's what I was looking for. That should not be a problem, assuming the tester knows what it's doing. :)
Do you have a concept of when you got 4.26.4? Perhaps there was a regression in it?
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