Is Realtek 2.5Gbe LAN issue fixed?

Posted by Temporary_Adagio_359@reddit | buildapc | View on Reddit | 124 comments

Hi newbie here. I'm planning to build my first pc with B550m Aorus Pro-p but found some old thread saying there was an issue with the realtek 2.5gbe (something to do with the driver) which cause their connection to randomly drop every few minutes. Is this still happening to anyone?

Sorry for my bad english.

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TotalOk8186@reddit

Apologies for bumping a really old thread, firstly u/dgsdedgdw fix worked for me, i have 1800mbps up and down, but was only getting 1030mbps up.

Upon investigation, at least in my instance, it seems that this setting configuration basically breaks cForSpeed which was the true culprit causing issues with my Realtek 2.5Gb NIC.

Simply removing the bundled Gigabyte Realtek drivers and reinstalling straight from Realtek did not fix my issue. But by removing cForSpeed (which comes bundled with Gigabyte Drivers) I immediately fixed my issue of upload throttling and was able to revert my Realtek drivers advanced settings to mostly default.

To remove CforSpeed i did the following:

1, Control Panel > Network and Internet > Network and Sharing Centre > Ethernet > Properties > untick cForSpeed.

Control Panel > Programms > Uninstall a programme > cForSpeed > uninstall
Restart PC.

I hope this is helpful to anyone else!

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dgsdedgdw@reddit

Sure, I am late but here are my advanced settings I optimised for best performance and lowest ping:

Advanced EEE - Disabled

ARP Offload - Disabled

EEE Max Support Speed - 1.0 Gbps Full Duplex

Energy-Efficient Ethemet - Disabled

Flow Control - Disabled

Gigabit Lite - Disabled

Green Ethemet - Disabled

Interrupt Moderation - Disabled

IPv4 Checksum Offload - Rx & Tx Enabled

Jumbo Frame - Disabled

Large Send Offload v2 (IPv4) - Disabled

Large Send Offload v2 (IPv6) - Disabled

Maximum Number of RSS Queues - 4 Queues

Network Address - Not Present

NS Offload - Disabled

Power Saving Mode - Disabled

Priority & VLAN - Disabled

Receive Buffers - 512

Receive Side Scaling - Enabled

Shutdown Wake-On-Lan - Disabled

Speed & Duplex - Auto

TCP Checksum Offload (IPv4) - Disabled

TCP Checksum Offload (IPv6) - Disabled

Transmit Buffers - 1024 (/2048)

UDP Checksum Offload (IPv4) - Disabled

UDP Checksum Offload (IPv6) - Disabled

VLAN ID - 0

Wake on Magic Packet - Disabled

Wake on magic packet when system is in the S0ix power state - Disabled

Wake on pattern match - Disabled

WOL & Shutdown Link Speed - Not Speed Down

If you have issues with still after these settings then here's the most recommended (in the context of addressing potential internet crashes) things I can suggest to do:

Flow Control: Enabling flow control is the most recommended setting because it helps manage network congestion and prevents packet loss, which can contribute to improved stability and reduced connectivity issues.

Receive Buffers and Transmit Buffers: Increasing buffer sizes (e.g., setting Receive Buffers to 1024 and Transmit Buffers to 2048) can help prevent packet loss and enhance network stability, making it the second most recommended adjustment.

Energy-Efficient Ethernet: Disabling Energy-Efficient Ethernet is a good practice to prevent potential connectivity issues, such as intermittent disconnections, making it the third most recommended setting.

Jumbo Frame: Leaving Jumbo Frame disabled unless you specifically require it is the fourth most recommended option. Enabling Jumbo Frame without proper support from your network infrastructure or devices can potentially lead to connectivity issues.

Priority & VLAN: If you don't have specific requirements for Quality of Service (QoS) prioritization or VLAN tagging, leaving this setting disabled is the fifth most recommended option. Enabling it without proper configuration or the need for these features may introduce complications.

Wake-on-LAN and Power Saving Mode: Disabling Wake-on-LAN and Power Saving Mode, if you don't require these features, is the sixth most recommended choice. These settings are generally unrelated to internet crashes, but disabling them helps prevent any potential issues related to waking the system or power management affecting network connectivity.

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RutabagaOwn4528@reddit

hi man, where do you find those parameter , thank you

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Universkillers123@reddit

You are a legend you know that? Honestly, all these configs are so confusing and learning them are a pain. This preset works really well!

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Metal_Load@reddit

March 2026 and this is still the right formula for that specific issue. I was about to throw my card out the window. Thanks a ton man 👍

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nfssan@reddit

Thank you very much! I was connected via WiFi 6 and also had this problem.

These two changes helped me: - ARP offload for WoWLAN - NS offload for WoWLAN both disabled.

Finally, I can connect to my local Hytale server without any problems.

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hmmhmmok@reddit

I love you. Just build a new computer at christams and been stuck with stutters ever since thank you so much.

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TrolliAU@reddit

I got thinking deeper and asked myself (and Co-Pilot) why does my laptop (windows 10) with built in Realtek Gbe NIC manage to achieve the desired upload and download speeds but I can't achieve them on my desktop Realtek 2.5Gbe NIC unless Nord VPN is running. I installed a new router AI Mesh system (Asus ZenWiFi-BT8) a few months and to rule out router issues I enable QoS on it. Low and behold, I managed to get LAN upload of 47Mbps! However, that came at a cost... WiFi upload speeds were then throttled to around 10Mbps so I disabled QoS on the router and everything reverted back to how it was previously.

Still feeling perplexed as to why is this happening given that my desktop is using the same LAN connection, on the same router, but with Nord VPN on, I get upload speeds of 47Mbps which is expected, but without it on, I am only getting about 10Mbps. This is where Co-Pilot came in...

Co-Pilot answered this question advising that Nord VPN uses a different MTU and suggested that I Powershell this code (netsh interface ipv4 set subinterface "Ethernet" mtu=1400 store=persistent) which would change my MTU from 1500. and to test it. As soon as that was changed, I got upload speeds of 47Mbps. I then changed it for ipv6 as well. It has been working flawlessly since.

When quizzing Co-Pilot what was the root cause it said:

Realtek NIC Driver Limitations

Realtek’s Windows 11 drivers struggle with full-size Ethernet frames (MTU 1500), especially during high-throughput uploads.

Symptoms include TCP retransmissions, QUIC anomalies, and malformed packets observed in Wireshark.

These issues are exacerbated by offloading features like Large Send Offload and Checksum Offload, which misreport packet boundaries or delay ACKs (I already had these disabled).

Windows 11 Network Stack Regression

Windows 11 introduced changes to congestion control, flow scheduling, and offload handling that affect Realtek NICs disproportionately.

Uploads stall or throttle when NICs fail to negotiate clean MTU boundaries or misalign TCP segments.

VPNs like NordLynx bypass this by enforcing a tunnel MTU (e.g. 1420), avoiding fragmentation and offload conflicts.

MTU Mismatch and Fragmentation

Desktop NIC was using MTU 1500 by default, but couldn’t reliably transmit full-size packets.

Router and wireless clients handled 1500 MTU perfectly, confirming the issue was not router-induced.

Manual reduction to MTU 1400 resolved fragmentation and retransmission, restoring full upload speed.

VPN Masking the Issue

NordVPN (NordLynx) consistently improved upload speed by enforcing MTU 1420 and bypassing Realtek’s offload stack.

This confirmed the issue was MTU-related, not ISP or router-based.

Resolution Summary

Set MTU to 1400 on desktop Ethernet interface:

powershell

netsh interface ipv4 set subinterface "Ethernet" mtu=1400 store=persistent

netsh interface ipv6 set subinterface "Ethernet" mtu=1400 store=persistent

Disabled offloading features in NIC properties

Upload speed restored to 47+ Mbps

Wireshark confirmed clean packet flow, no retransmissions

I hope this is able to help others who experience the same things and hope that Microsoft, Realtek, Asus and others are watching and can take some learnings from this!

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fobbywillie@reddit

this fixed my speed issue, must have came with some win11 update

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_R3b0rN@reddit

Very interesting.. 🤔

I'm willing to test this later today as my network still has intermittent issues with gaming that my ISP is mostly to blame but if I can reduce the MTU router and client side and get better results. Well that'd be a great thing

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PreviousBus2973@reddit

Thanks, king

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Ray-Zide@reddit

you the GOAT bro thank you, literally just 2.5x my download speed

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stenofylla@reddit

what an absolute hero

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Lombex@reddit

ty so freakin much, 2 years later and the problem still exists on a brand new 870e Mainboard

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luashfu@reddit

Amazing list in alphabetical order!

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Prestigious_Dance818@reddit

I could kiss you right now.

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thekkwapps@reddit

For me just fixing -

UDP Checksum Offload (IPv4) - Disabled

UDP Checksum Offload (IPv6) - Disabled

Helped with UDP traffic, I couldn't hold connection to Azure AVD for more than few clicks, this alone fixed the problem.

I did disable all other power saving features .. Ethernet Lite, Green Ethernet etc. because idle connections were still getting affected by and losing RDP sessons. Now all problems are fixed. Use ChatGPT for details on all Advanced Tab settings and select what you need.

Thanks mate, I was going crazy with this problem - all good now.

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_R3b0rN@reddit

Wow... after all this reading and searching and cursing... this actually worked. I didn't expect it to, I was ready to throw the damn board with realtek away and start fresh. Tried this as a literal last resort and it got my 1gb fiber connection back on track with the upload.

Thank you.

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ShadyMcCheeks@reddit

Confirmed these settings fixed my issues for valorant stuttering, tysm!

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davidshen84@reddit

Hi, how do you make these configurations? In BIOS or in some app? Thanks

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rivadoshido@reddit

Device manager > Network Adapters > Double click realtek lan (realtek gaming in my case) > Advanced

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TackleKind9525@reddit

Thank you whoever you are! I’ve been having trouble getting into Warzone and disconnecting before loading in but works everywhere else. I’ve used these settings with that driver and it’s actually working! I’ve tried everything. Even had an engineer out to change my virgin wires. 🙌🙌

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The_Lorax_59@reddit

2 Years later and your still helping people my God I love you

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grinderzzzz@reddit

ur a god

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darkryne88@reddit

dear lord thank you! I never had issues up until recently. It must have been some stupid update

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xGoatfer@reddit

Crazy how 3 years later this still isn't fixed. This worked for me but the next day it was back to 100/100. I had to change the Receive buffer back to 1024 then it seemed to work fine again.

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Oh_Fuck_Yeah_Bud@reddit

Absolute Chad thanks!

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d4rk5id3r@reddit

Several games wouldn't allow me to play multi-player. This fixed it for some odd reason.

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Helicees@reddit

This surprisingly fixed a crashing issue introduced in BG3 patch 8, for me and my friends.

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rhopiz@reddit

bro, thanks this solved my BG3 connection issues.

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Viddix@reddit

A year later and this is saving my ass. Helped me out big time. Thought my new PC was messed up or something. Thank you kind stranger.

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OldTwiist2@reddit

bless

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VariousCod4895@reddit

Ty gimme kiss rn

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Objective-Sample2600@reddit

Dude, you just saved me hours of debugging. That is amazing! Thanks!

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waflmlk@reddit

Bro, you are a KING! I had a friend who couldn't play phasmophobia (and only that) via ethernet error: Disconnected:Exception, it's not even the same mainboard, but probably a similar or the same ethernet adapter of realtek? Anyway: Nothing helped, but then out of sheer luck I just googled "issues with 2.5 gbit ethernet adapter", found your post and just decided to try it, i have no idea what setting exactly fixed it, but it fixed it.

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NobleTrooper@reddit

Wait, so do you disable or enable flow control?

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nsfwhola@reddit

i have enabled RxTxEnabled

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NobleTrooper@reddit

Thanks

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Perend@reddit

Bought a brand new Gigabyte mobo and went from 40-45% (on a 1.2Gbps connection) packet loss to 0 with these settings. You sir are an internet god.

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BigJames_94@reddit

not all hero's wear capes. Thank you

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Suspicious_Shift_563@reddit

A year later and 50 other fixes tried and this was what fixed my issue. Thank you!!!

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DaddyDusky_@reddit

bro, whoever you are i hope you the best in your life, thank you, this fixed my issues with the disconnections gif

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Dry-Dealer2081@reddit

Glad it worked for you, does not cure my dropping of speed from 1000/1000 to 100/100 or even 10/10 ........ beyond a joke now!!!!

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AccordingSecretary36@reddit

I have this issue with a msi b650-s pro wi-fi, 100mb down to 10 and random disconnect from the internet, not the wifi...

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Noiprocsx@reddit

changing rss queue to other value or disabling interrupt moderation might help

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Minimum-Pension92@reddit

Did you find out a way to fix it? I'm having the same or similar issue.

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c4plasticsurgury@reddit

I'm haviing this issue have you fixed it?

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enterpernuer@reddit

VERY VERY VERY LATE reply i found the solution:
quote from other user
valorshine • 1y ago•

-Check if your cable support 1gb or is not damaged (yes it can).
-Chcek if your switch / router support 1gb. Sometimes not all ports support 1gb, check that too.

-Check the "speed& duplex" in your network card. If the drivers or card support 1gb

device maanger -> your network card (right click) -> advanced -> advanced tab -> "speed& duplex"

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Far-Pea-1134@reddit

Hello, this doesn't resolve the problem a lot of people has that problem.

I'm looking for a solution too and tried a lot of thing but nothing work.

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enterpernuer@reddit

I downloaded latest lan driver, uninstall msi center, force to 2.5gps, pull the lan cable out and force it make a soft reset.

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bbraz761@reddit

For this problem you have to change the Speed & Duplex setting 2.5Gbps Full Duplex

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Only-Sympathy-6527@reddit

Hatte sehr lange sehr viele Probleme, du bist ein Held!! Mit den Einstellungen für den LAN Treiber läuft es, hast du oder jmd anderes auch noch Treibereinstellungen für den WLAN Treiber von Realtek?

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DentureTaco@reddit

Thank you so much for posting this. Ever since upgrading to a Gigabyte x870 motherboard with Realtek LAN and installing Win11 I haven't been able to join ANY multiplayer games, and my network performance was horrific on ethernet but everything worked on Wifi (not ideal). This fixed the issue after days of pulling out hair and failed google searches. Thanks again... I love you!

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EchoWar@reddit

Legend. Thank you.

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CosmoMomen@reddit

December 2024, just fixed my PC. Thank you very much.

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wowitsreallymem@reddit

This worked for me. Thank you.

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awildawn@reddit

Hi, I am from the future : Thank you, you just saved me from buying a new NIC

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TheMountainLife@reddit

Thank you. Can confirm this fix still works a year later after the initial post. Upgraded my rig recently and was getting a max of 270 mbps download on Steam with the integrated Realtek card but speed tests were reaching 2 Gbps down as expected. After the change Steam games are now downloading around 1.2 Gbps. I'm subscribed to 2gb down / 350 up.

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khemne@reddit

THANK YOU! you saved my day

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This_Is_Fuego@reddit

This guy is a hero.... THANKS SO MUCH!

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hawkeye1194@reddit

Where do I set these settings?

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hawkeye1194@reddit

Nvm. Found them in the network adapter settings for this Ethernet controller in windows device manager.

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Necessary_Cut_8391@reddit

Hello, I am facing ping issue on my Alienware laptop while playing valorant, with same ethernet cable on other laptop I could always get pings in single digit. Could you help me navigate to above settings? I couldn't find many of them. Thanks in advance

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DontFuckWithGABA@reddit

I am coming back to this post regularly because through driver updates the setting always get reset.

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rmckedin@reddit

Oct24 and this still working - thank you!

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lordfoull@reddit

Totally worked today for me; I had 2024 Sept 27ths newest Realtek drivers installed and still was screwed until I changed those settings it would drop out continually.

Thank You!

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Tobi_to_Obi@reddit

i can not set Transmit Buffers more than 128 why is that or will this effect in ping spike and packet loss

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vo0d0ochild@reddit

You're a god thank you

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Electronic_Theory_29@reddit

Wow thanks for this highly specific advice, I hope this fixes it!

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SwaggerOnTheRocks@reddit

Thanks for writing all this up, I learned a lot.

Sadly hasn't helped me.
My PC still constantly disconnects from the internet and all audio is crackling/popping.
Some kind of catastrophic driver/hardware incompatibility.

Specs:
GPU: Gigabyte GeForce RTX 4070 Super Eagle OC
CPU: Ryzen 7800x3d
RAM: DDR5 32GB 6000MHz CL30 (Corsair VENGEANCE RGB)
MOBO: MSI B650 GAMING PLUS WIFI

If anyone is planning a similar build and you read this beware.

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Peekini@reddit

Exact same issue here :( almost same specs

GPU: Sapphire Pulse RX 7800 XT
CPU: Ryzen 7800x3d
RAM: DDR5 32GB 6000MHz CL30 (Corsair VENGEANCE)
MOBO: MSI B650 GAMING PLUS W

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SwaggerOnTheRocks@reddit

Sorry to hear man, still no solution yet for me either.

I'm just going to RMA it and get a new one I guess, after 12 days of troubleshooting I lost hope.

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fontoura222@reddit

YOU'RE A WIZARD HARRY! Thank you!

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JacobinoIII@reddit

Man, You're a legend.

Thanks, really.

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evilskater@reddit

"Large Send Offload v2" fixed my download problem.. but this config is being lost after reboot... any advice?

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FreedomNerd123@reddit

Found this thread when I just built a new machine with the Realtek 2.5GbE Network adapter. I tried the settings by u/dgsdedgdw and didn't see a huge improvement, but really thankful he pointed me in this direction. I copied the settings from a different machine on my network that consistently had good connections and download speeds.
Here's what I came up with for my settings that seems to be working better for me:
Sure, I am late but here are my advanced settings I optimized for best performance and lowest ping:

Advanced EEE - Disabled

ARP Offload - Enabled

EEE Max Support Speed - 1.0 Gbps Full Duplex

Energy-Efficient Ethemet - Disabled

Flow Control - Rx & Tx Enabled

Gigabit Lite - Enabled

Green Ethemet -Enabled

Interrupt Moderation - Enabled

IPv4 Checksum Offload - Rx & Tx Enabled

Jumbo Frame - Disabled

Large Send Offload v2 (IPv4) - Enabled

Large Send Offload v2 (IPv6) - Enabled

Maximum Number of RSS Queues - 4 Queues

Network Address - Not Present

NS Offload - Enabled

Power Saving Mode - Disabled

Priority & VLAN - Priority & VLAN Enabled

Receive Buffers - 512

Receive Side Scaling - Enabled

Shutdown Wake-On-Lan - Disabled

Speed & Duplex - Auto Negotiation

TCP Checksum Offload (IPv4) - Rx & Tx Enabled

TCP Checksum Offload (IPv6) - Rx & Tx Enabled

Transmit Buffers - 128

UDP Checksum Offload (IPv4) - Rx & Tx Enabled

UDP Checksum Offload (IPv6) - Rx & Tx Enabled

VLAN ID - 0

Wake on Magic Packet - Disabled

Wake on magic packet when system is in the S0ix power state - Disabled

Wake on pattern match - Disabled

WOL & Shutdown Link Speed - Not Speed Down

I'm not an expert on these settings, but this made an improvement for me... I may still tweak them a bit here and there, but big thanks to u/dgsdedgdw for pointing out changing these settings.

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AJRey@reddit

Just so you know, turning on Gigabit Lite will cap your speeds at 500mbps. If you truly have a gigabit speed, you want to disable that.

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kinsi55@reddit

gigabit lite is a technology that allows you to get 500mbps over a link that otherwise could only do 100mbps (Two twisted pairs rather than 4) - This only works if both sides support gigabit lite tho.

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Dragontech97@reddit

My link speed in windows 11 still reads 1000Mbps(Cat6 plugged into gigabit port on router) so this setting is a bit of an enigma for me. Maybe it does limit the actual speed via the driver but the link speed still detects the full gigabit. Can't test myself as I don't have gigabit speeds

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llunga@reddit

Most probably this setting is intended for situations when a laptop switches to the battery mode.

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VijuaruKei@reddit

Can confirm, after years and years of looking for a solution, I've spent a whole day with this configuration and my 2.5 gbps internet hasn't disconnected so far, I had to limit myself to 1 gbps because 2.5 would drop every single hour, so far so good.

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VijuaruKei@reddit

You are not having any disconnect because you're capping the speed to 1.0 Gbps with the "EEE Max Support Speed - 1.0 Gbps Full Duplex", the disconnect happen when you use the 2.5 Gbps speed.

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Ravenarrows@reddit

Original poster be like "You can't go alone, take this"

<=========()⊂(◉‿◉)つ

Still helping to this day.

You saved the internet.

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Cautious_Tax_9497@reddit

Looks like this fixed my packet loss issue. Thank you!

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CacheEX88@reddit

"Hello, I've also had this annoying problem with the Realtek Network Interface Controller 2.5G Gigabit Ethernet RTL8125B(G) on my MSI motherboard for a year now! I always turn on my Wi-Fi because it's faster than my LAN adapter! The strange thing is, sometimes the LAN port works without limitation at full speed, and then other times it doesn't, and I can only download at a maximum of 10 Mbit/s, and the ping is high! I've already installed the latest drivers directly from Realtek without success!"

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kugamezwei@reddit

I know that playing with receive and transmit buffers can reduce the latency, but keep in mind that, if you set the receive buffer too low, you will face system crashes really often.

I've tested it on my PC. And I can tell that setting the receive buffer too low, will result in BSoD with KERNEL_SECURITY_CHECK_FAILURE error.

If you have for example an 1 gigabit (download and upload) network, setting it at minimum 256 is safe. At 128 can be risky now.

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CJPTK@reddit

Remindme! -4 hours

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Aggressive_Task_8642@reddit

I bought my new motherboard last June 28, 2024, with no issues. Everything works fine, playing online and intensive games. Suddenly, when I open games, LAN disconnects from the internet. I thought only in the online games, but even in offline games or any games, my internet disconnects. I restarted my PC, and everything worked fine. The internet connection was fine; I could browse and download, and it was fine, but the LAN connection disconnected whenever I opened any games I reinstalled the OS, installed updated drivers. But the problem persists. My motherboard is an Asus TUF B650m plus wifi. Any help would be appreciated.

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Immediate_Plate_3662@reddit

Same problem but with the Asus TUF B650 Plus-Wifi and with the detail that the mouse also freezes a few seconds before disconnecting the PC's ethernet

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TieflingsAreEvil@reddit

Same issue, did you find a solution?

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nsfwhola@reddit

i have a normal network and where server room is there is sadly only one LAN-port so i have bought a small swich from tp-link so that i can run the old server with Microsoft windows server 2012 and the new server with microsoft windows server 2025 parallel and on default settings (you can get the default settings mostly if you delete the network card in the device manager and search for plug'n'play capable devices in the device manager) everything works fine but since i want the best server of all dental offices i know, i have bought the Gigabyte Aorus X870E elite wifi7 and built the new server completely from scratch and i can't be happier

and when i change Speed & Duplex - Auto to let's say speed & duplex 2.5 gbits full duplex and after a few minutes, both servers (since they are sharing the same small switch) are unrespondable. sadly. it seems like 1 gbits is totally different than 2.5 gbits.

i wanted the best DIY-server, super strong and all but sometimes you have to go a step back. i have even increased Jumbo Frake to 16K something bytes and it's still fine.

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Osemitsu@reddit

I will add my experience here as this is was driving me crazy and still kind of is.
I have Asrock b650m pg raptide + 7600x

TL:DR: external USB LAN adapter solved the problem, but sometimes I still have 5-10s internet lags (instead of total random crashes), which might be duo to low adapter cost.

I had heavy lan malfuctions mostly during onlinegaming, which was not indicated by any crash of driver or so.
I tried to investigate myself, but was unable to identivy concrete issue. One was certain, it is something with internet.

What is funny - every trial of changing something (e.g. OS installation, ram memory reconfiguration, realtek driver update) was helping , but only for limited time (max 3days - 2 weeks), then it was starting to fail again.

I found this topic. Used the adviced ethernet card settings - it helped for some time (hehe). Then again internet connection just failed.

Finally I decided to buy the external USB LAN adapter. It helped 100%.
Now i do not have any disconnects or so/ Only sometimes I have lags for like 5-10s max once every few hours. This is very acceptable comparing to total, random lan shutdown. Maybe I bought too weak adapter (15$, local company, 1gb/s). Maybe buying PCI-express Lan card would be better solution.

But this should not be like this. I see that many other manufactures of MOBOs have this, not only this variant of Asrock. My purchaser refused to replace my motherboard if no flaw would be found after I would send it to them (and loose my PC for weeks). Of course they would send it to Asrock after receiving it from me...
Asrock would replace or just sent it back (I need to mention that this motherboard is my 2nd same one, as 1st was totally bricked somehow, which was probably related to early AM5 ram problems; I've got new replacement).
Anyway, that was not worth a try. I also thought to change motherboard, but now when I have this external usb lan I am OK with it (not pleased), but OK.

Is there any better fix at the moment ? Maybe some bios update ? I stopped to update fearing something else would blow up :D. I know I could buy another motherboard with hope that it will work correctly, but again, this is not right. I would do it, if external Lan would not fix the problem.

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NevoBuri@reddit

For anyone having issues with the bi*chy Realtek PCIe FE / GBE / 2.5G / 5G Ethernet Family Controller:

For me at least i had issues with the networkcard falliung back to 100/100 (Mbps) connections and not using the 1000/1000 (Mbps) after my PC got to sleepmode and i woke it up or just after some time. I just waited long enough so that Realtek released new fixes drivers (at least for me). Which took them long enough.

Here is the driver URL:

Realtek Realtek PCIe FE / GBE / 2.5G / 5G Ethernet Family Controller Software

And if the link does not work just contact me, i'll send it to you. :)

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TheRoeski@reddit

I could not for the life of me find the updated drivers from Realtek. Thank you so much. Hopefully this solves my lan port bricking after I try to start a discord call.

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NevoBuri@reddit

Keep us updated, could help some people. :)

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TheRoeski@reddit

It didn’t fix it… I’m at my wits end. It’s not every time I start a call, it just seems to be after the computer is idle for a while (overnight). I have to disable the 2.5 family controller in device manager, at which point the device manager becomes unresponsive. Then I have to restart the computer, but it gets stuck on restarting so I have to do a hard shutdown. Turn it back on, reenable family controller, and I’m good to start my call. If anyone knows what the issue might be, please let me know. It’s a new build and this is the last issue I have yet to solve.

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Syscerie@reddit

This is the exact issue i am having bar for bar. Did you ever figure it out?

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TheRoeski@reddit

Yes! It was windows firewall. I had made an inbound exception for discord but never made an outbound one! That did the trick. I know you commented a while ago but I hope that helps!!

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Syscerie@reddit

i ended up replacing the motherboard and that fixed the issue for me

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NevoBuri@reddit

Seems like you are not just having problems with the network controller itself. maybe it's a bad mobo. But when did u last do a fresh windows install?

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TheRoeski@reddit

I built the computer less than a month ago. I moved my hard drives (including the windows boot drive) from my old computer and upgraded from windows 10 to windows 11 just after it was built. I don’t know if that’s considered. I’ve updated all the drivers and done windows updates. I really hope it’s not a motherboard problem…

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NevoBuri@reddit

You should try a clean install, if that is a possibility for you. You could isolate the problem that way. If that would not work you should maybe try a RMA with your mobo. I am just trying to help, feel free to consider it... or not 😂.

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TheRoeski@reddit

What makes you think it might be a motherboard issue? I only have a problem when I make a discord call. Anything else (YouTube, installing games, etc…) I have no problems at all. I have done a fresh install of discord but it didn’t help. Thanks for all your insight!

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NevoBuri@reddit

Just clearing possibilities one after the other i guess. Just make a clone of your drive maybe and try a fresh install for some days. If that does not help u can just roll back.

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Acrobatic_Service587@reddit

My New Found Friend... Thank You for your time spent helping elevate all of us with this informative assistance... Your CLUTCH...!!

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mac224488@reddit

got a new computer (internet worked ok) then upgraded to fibre and my ethernet connection was either very slow or dropped off completely - only solution was to use wifi which at least worked - however tried the settings at the start of the post and got the ethernet connection back - only issue is when I test it the download speed is around 580 (where i expect it) but the upload is still weak (around 80) it should be around 400 (tried on another computer) - any ideas what I can tweak to improve the up load speeds?

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bkjkdixon@reddit

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Bonhomie_999@reddit

Realtek driver just trash. I don't know why only windows having this issue. Everytime I use windows for gaming and downloading, my internet get cut but on linux (ubuntu) there isn't a problem with ethernet at all.

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EndPutrid8046@reddit

Same problem with my new MSI B650 GAMING PLUS WIFI, Realtek Gaming 2.5 GbE Family Controller.

I installed the latest version of the driver on the realtek site (dont install from the motherboard site) and so far it works. I'm waiting to see if the problem comes back.

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Waste_Technology_335@reddit

i have the 100/100 problem i try to update the drivers and its still not working

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spoom17@reddit

I've had a similar issue with an Asrock X670E where it would not connect to certain websites and failed at login with steam for example while producing decent download speeds elsewhere. I tried everything including updating drivers changing LAN cables and even reformatting the PC, the issue remained the same.

I finally updated the drivers from Realtek directly instead of the Asrock website (even though it's the same driver version and date) it seems to have fixed the issue. Just dropping this here in case someone finds it useful.

Realtek website: https://www.realtek.com/en/component/zoo/category/network-interface-controllers-10-100-1000m-gigabit-ethernet-pci-express-software

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poorty28@reddit

I just updated to the latest version from Realtek directly. Seems to be working ok so far. I initially installed the newest version direct from ASUS website V1125.9.614.2022 which seems to be a little older than the current Realtek version V1125.16.1123.2023. With the ASUS driver my connection would start at 1000/1000Mbps and then after an hour or so would drop to 100/100Mbps which is a giant pain in the ass.. hopefully this fixes my issues too. Thx for share.

Asus Version - Realtek LAN Driver V1125.9.614.2022 for Windows 11 64-bit

https://www.asus.com/au/motherboards-components/motherboards/prime/prime-z790-p-wifi-csm/helpdesk_download?model2Name=PRIME-Z790-P-WIFI-CSM

Realtek LAN Driver V1125.16.1123.2023 for Windows 11 64-bit

https://www.realtek.com/en/component/zoo/category/network-interface-controllers-10-100-1000m-gigabit-ethernet-pci-express-software

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poorty28@reddit

It seems like the stability and dropouts are fixed, but the connection is still dropping from 1000Mbps to 100Mbps. Going to try and replace the network cable and see if that helps. My current Cat 6 is a flat white Amazon cable. I’ve read these can be a bit hit and miss in terms of quality.

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poorty28@reddit

UPDATE - After installing the newest version of the driver direct from Realtek and replacing my 'flat' CAT6 cable with a better quality round, magnetically shielded cable speed is 1000/1000Mbit and NO DROPOUTS!!

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FoHlined@reddit

Hi, i have an CAT 7 white FLAT Amazon Cable and i have the same problem! Is this problem really fixed for you? I really going crazy by this. I am communicating with MSI since few Mails to solve or find the problem. All settings they have me told are set, but don't work. Only stable with 100 mbit/s.

PLEASE give me an update.

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poorty28@reddit

Yes better quality Cat6 cable fixed this (not flat) and updating driver for Realtek LAN with current version. No dropouts and full 1000/1000 speed.

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retainftw@reddit

Hi, just wondering if you are still good with your described fix above? I'm posting about the same issue (drop of gigabit speeds to \~20 mbps during the course of several hours) and found you through a search.

I just updated to the latest Realtek drivers, now 10.72.524.2024 from 5.24.24. Haven't had time to test the results.

https://www.reddit.com/r/ASRock/comments/1ep913z/much_slower_ethernet_speeds_on_my_x670e_pg/

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poorty28@reddit

Yes. Update drivers and get better quality cable.

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FoHlined@reddit

I have tested my cable via Realtek Diagnostic Utility and i saw my 15m Amazon Flat Cable was measured 50m. That means for me it is very bad!

Today my new cable CAT6 not flat https://www.amazon.de/dp/B00BQDLL94 is measured with 34m. Much better but not that good, because it should be round about 15m :)

BUT it works, no problems anymore with the connection for 8 hours! That is a record with 1gbit/s for me. The problem seems to be solved, thanks.

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FoHlined@reddit

Everything damn fixed by new round not flat cable. jesus christ

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FoHlined@reddit

PLEASE give me an update.

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Narrheim@reddit

Very late here, but i can say, the drivers are quite messed up. Just spent 2 months trying to figure out, why my whole computer is randomly rebooting, when using internet (no, it didn´t just hang the driver or disconnected LAN, computer kept going yolo into reboot). I was already on the verge of RMAing either motherboard (Z790 Gaming X AX) or CPU (13600K). As a last-ditch attempt, i plugged 1Gbit PCIE ethernet into the motherboard, plugged my LAN cable into it and voila - no more reboots.

Then later i´ve got an idea. After each fresh Windows install (did 2 in a row with the same results), one of the first things i did, was install LAN driver from motherboard vendor. And that was a grave mistake! It seems that somewhere along the 2024 updates, Realtek made another flop in their drivers. Because reverting the driver to "windows default" (the one Windows itself installed after i installed Windows on this machine) seemingly did the trick. It´s a really old one now - version 10.56.119.2022 from 19.01.2022.

Meanwhile, the unstable one, that i kept installing and then spent eternity wondering why it doesn´t work, is 10.071.0312.2024 from 12.03.2024.

It somehow reminds me of a mess i had to solve in 2019, when i built AMD Ryzen build with X570 board, that had intel i211 on it. Again, motherboard driver on Gigabyte website was broken and i had to look for older driver to get it to work (eventually, i found one for some Asus X470 motherboard, which i used to the very last day of using that motherboard).

Is there a way to look into Realtek´s own patchnotes to see, what they changed in any update?

And i´m still thinking about getting some other PCIE LAN, just not Realtek (due to how Realtek cheaps out on LAN internal hardware and leaves entire LAN load onto the CPU).

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Narrheim@reddit

I´m gonna add a new one - my motherboard´s (Gigabyte Z790 Gaming X AX Realtek 2.5Gbe got its problems on a whole another level - it can cause my PC to reboot at low loads, specifically when browsing the internet or watching youtube videos.

It seemed impossible at first, but when i thought about how people were having issues with switches hanging and routers resetting, i thought to myself: "Why not?". My wild guess about what´s happening is this: The driver will hang/stop responding. CPU core managing the LAN will attempt to wait for the driver to start working again. Another core will look at the one waiting, which will appear as if it hanged/froze, which then prompts whole CPU into restarting the computer.

Feel free to correct my theory.

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The_0bserver@reddit

I know I'm super late to this thread, but for anyone else facing the same issue, I'd highly recommend assigning a static IP via your own router's DHCP.

After you assign it, just go to cmd and then do

ipconfig /release

(which should assign the same IP as your DHCP set value - can be same as before, if thats what you set - which is what I did). You should be golden then.