R6220 issue with LAN

[trailblazer]

I have recently installed OpenWRT on my Netgear R6220. It seems my laptop has some issue while connected to the LAN. The laptop has a 100mbps port and I have connected it via a cat5e ethernet cable(14 feet long). The connection get interrupted every 13-15 minutes(sometimes even afer 40minutes) or so. After messing with it for around I have seen some specific characteristics. BTW, all other LAN devices seems to work just fine.
I tired to disable flow control on my laptop and set the speed and duplex to 10mbps/Full from auto-negotiation and it was working fine, until I reformatted my device. After which I am having the same issue. I tried the above fix but it isn't working this time. I have assigned my laptop a static IP.

Tue Sep 21 00:01:55 2021 kern.info kernel: [631168.180694] mt7530 mdio-bus:1f lan2: Link is Down
Tue Sep 21 00:01:55 2021 kern.info kernel: [631168.190414] br-lan: port 2(lan2) entered disabled state
Tue Sep 21 00:01:55 2021 daemon.notice netifd: Network device 'lan2' link is down
Tue Sep 21 00:01:57 2021 kern.info kernel: [631170.228816] mt7530 mdio-bus:1f lan2: Link is Up - 100Mbps/Full - flow control off
Tue Sep 21 00:01:57 2021 kern.info kernel: [631170.243986] br-lan: port 2(lan2) entered blocking state
Tue Sep 21 00:01:57 2021 kern.info kernel: [631170.254625] br-lan: port 2(lan2) entered forwarding state
Tue Sep 21 00:01:57 2021 daemon.notice netifd: Network device 'lan2' link is up

Kernel Log:

[600847.872792] mt7530 mdio-bus:1f lan2: Link is Down
[600847.882492] br-lan: port 2(lan2) entered disabled state
[600849.920929] mt7530 mdio-bus:1f lan2: Link is Up - 100Mbps/Full - flow control off
[600849.936149] br-lan: port 2(lan2) entered blocking state
[600849.946807] br-lan: port 2(lan2) entered forwarding state
[601213.436913] mt7530 mdio-bus:1f lan2: Link is Down
[601213.446656] br-lan: port 2(lan2) entered disabled state
[601216.509096] mt7530 mdio-bus:1f lan2: Link is Up - 100Mbps/Full - flow control off
[601216.524318] br-lan: port 2(lan2) entered blocking state
[601216.534980] br-lan: port 2(lan2) entered forwarding state
[601842.166206] mt7530 mdio-bus:1f lan2: Link is Down
[601842.176294] br-lan: port 2(lan2) entered disabled state
[604492.249853] mt7530 mdio-bus:1f lan2: Link is Up - 100Mbps/Full - flow control off
[604492.265018] br-lan: port 2(lan2) entered blocking state
[604492.275658] br-lan: port 2(lan2) entered forwarding state
[604686.807533] mt7530 mdio-bus:1f lan2: Link is Down
[604686.817360] br-lan: port 2(lan2) entered disabled state
[604688.855692] mt7530 mdio-bus:1f lan2: Link is Up - 100Mbps/Full - flow control off
[604688.871176] br-lan: port 2(lan2) entered blocking state
[604688.881837] br-lan: port 2(lan2) entered forwarding state
[604933.588803] mt7530 mdio-bus:1f lan2: Link is Down
[604933.599007] br-lan: port 2(lan2) entered disabled state
[604936.660921] mt7530 mdio-bus:1f lan2: Link is Up - 100Mbps/Full - flow control off
[604936.676084] br-lan: port 2(lan2) entered blocking state
[604936.686720] br-lan: port 2(lan2) entered forwarding state
[604955.092565] mt7530 mdio-bus:1f lan2: Link is Down
[604955.102327] br-lan: port 2(lan2) entered disabled state
[604959.188755] mt7530 mdio-bus:1f lan2: Link is Up - 10Mbps/Full - flow control off
[604959.203745] br-lan: port 2(lan2) entered blocking state
[604959.214393] br-lan: port 2(lan2) entered forwarding state
[604967.380418] mt7530 mdio-bus:1f lan2: Link is Down
[604967.390127] br-lan: port 2(lan2) entered disabled state
[604970.452624] mt7530 mdio-bus:1f lan2: Link is Up - 100Mbps/Full - flow control off
[604970.467791] br-lan: port 2(lan2) entered blocking state
[604970.478441] br-lan: port 2(lan2) entered forwarding state

[psherman]

Just to rule out ports and cables, can you try the following:

• connect the laptop using the same cable to a different physical port on the R6220.
• Try a different device (something other than your laptop) connected by the original cable and port.
• Swap the current cable for another known-good cable and try it on the original port (LAN2 / port 2) and with the original laptop

[trailblazer]

Tried all of the options, the issue remains.
I had one other laptop from HP, connected to LAN2 with the original CAT 5e cable, it too dropped connection after like 4 minutes.

But, both my laptop(DELL) and the HP laptop have one thing in common, they both have Realtek PCIe FE Family Ethernet Controller

Edit:-I have one more DELL(LAN4) laptop from back in 2012, it has Realtek Gigabit Ethernet, and runs TrueNAS Core, it works absolutely flawless along with my Desktop(LAN1; Gigabit, Flow Control rx/tx) and my Archer C50(LAN3) running OpenWRT 21.0.

[trailblazer]

I guess I figured it out.
So far the problem occurred only on Realtek FE Ethernet controller enabled devices that supports upto 100mbps and running windows only.

What I did was turn off ARP Offload and Flow Control settings form the advanced properties of the controller. I have tested this configuration for more than 8 hours and the connection never dropped.

[nemesis]

Is this something you did on your router or on your laptops?

[trailblazer]

I changed the setting on my laptops. Open Run and type ncpa.cpl. Right click on your ethernet controller and click properties and go to configure then click the advanced tab.