Not able to ping PC connected with Ethernet cable

Pouriam

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Hello there, I have a problem in my local network that I can't figure out on my own, much appreciate it if someone can suggest a solution.

On my local network, I have a PC and a laptop. My pc has windows 10 pro, and my laptop has windows 11 pro installed. Recently I set up file sharing and remote desktop on my local network, my goal is to connect to the PC from my laptop.

When my pc is connected to the modem via LAN cable, I cannot ping it from my laptop when the laptop is also connected to the modem with LAN cable, but when I disable ethernet on my laptop and connect with WIFI, I'm able to ping the PC.
The odd thing is that when I connect the PC to the modem over WIFI and disable Ethernet, I'm able to ping it from my laptop whether it's connected through WIFI or LAN. I have a laptop with windows 10 pro installed, and everything works fine whether Lan or WIFI. So I suppose the source of the problem is not in my modem, which I also checked and there's no MAC filtering on it. So it's safe to say that the issue is with the windows 11 itself. I tried to google the issue, and found bunch of solution that neither of them worked in my case, but I list them here here so you could see what I have done so far:

1. the drivers for the laptop are all up to date, I tried to uninstall modem drive and let the windows figure out the correct driver and it didn't work, I also downloaded the drivers manually both from the Dell and Intel websites and they didn't work as well.

2. The network is set to be private, DHCP is set to autoconfigured, I also checked with setting manual static IP on both machines and it still didn't work, disabling IPv6 on my laptop didn't work as well.

3. I'm using Bitdefender total security, I disabled everything and didn't work. Also booted in safe mode and still didn't work.

4. reset network settings with these commands and didn't work as well:

ipconfig /flushdns ipconfig /renew nbtstat –R nbtstat –RR netsh int ip reset c:\resetlog.txt netsh winsock reset

5. I tested with different ethernet cables and even used different ports on the modem, and noting change. I believe it's not a cable problem, because the same Ethernet cable works totally fine when I connect it to my windows 10 laptop.

At the end I contacted Microsoft support and they suggested to downgrade to windows 10 and wait for the official release of windows 11, Since it takes a lot time to reinstall everything, I preferer to make it work on my current install and I'm open to any suggestion.
Sorry for the long post and thank you all in advance.
 
Windows Version
Windows 11 pro

My Computer

System One

  • Operating System
    windows 11

Berton

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Microsoft's suggestion was valid, Win11 is still in testing, not yet released for user consumption. Problems are still being worked on. It has been announced for Oct. 5, 2021, but many computers will not meet the requirements. I have Insider Preview Dev Channel running but the computer definitely does not meet the requirements for the RTM/Released to Marketing/Manufacturing.
 

My Computer

System One

  • Operating System
    Windows 10 Pro

iko22

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4. reset network settings with these commands and didn't work as well:

ipconfig /flushdns ipconfig /renew nbtstat –R nbtstat –RR netsh int ip reset c:\resetlog.txt netsh winsock reset

These commands are for the Internet. If you specifically have identified the problem is Ethernet, then I would recommend working through these suggestions:
 

My Computer

System One

  • Operating System
    Windows 10
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