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Windows 11 24H2 having issue when ethernet and WiFi both connected

Anonymous
2024-12-17T18:46:08+00:00

Hi All,

After upgrading my 5 systems on Win11 24H2, I started facing an issue as below,

  • System having Ethernet and Wi-Fi interface connected and having network connectivity
  • Wi-Fi interface having interfacemetric configured as lower, so I want normal traffic passing through should go through Wi-Fi interface
  • Installed tightvnc server on Windows system
  • From remote machine I try to access VNC through Ethernet IP and I can see traffic being received on Ethernet interface, but when VNC reply is being send it is being send through Wi-Fi interface and that is breaking the communication.
  • If I disable Wi-Fi interface then I can access VNC through Ethernet IP without issue

On other Win11 23H2 it was working as expected and did not face an issue.

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  1. Anonymous
    2024-12-19T01:20:46+00:00

    Hello ,

    Thank you for posting in Microsoft Community forum.

    Based on your description, here are some possible solutions and suggestions:

    1. You can check the current routing table through the command prompt to make sure that the traffic goes through the correct interface. Open the command prompt and enter the following command:

    route print

    Check the routing table and make sure that the routing priority of the Ethernet interface is higher than that of the Wi-Fi interface.

    1. You mentioned that the interface metric of the Wi-Fi interface is lower. Make sure that the metric of the Ethernet interface is set to a lower value so that the Ethernet interface is used first. You can adjust it by following the steps below:

    Open the "Network and Sharing Center". Click "Change Adapter Settings". Right-click the Ethernet connection and select "Properties". Select "Internet Protocol Version 4 (TCP/IPv4)" and then click "Properties". Click "Advanced" and set a lower value in "Interface Metric".

    1. If possible, assign a fixed IP address to the Ethernet interface to ensure that all traffic goes through the interface.
    2. Make sure that Windows Firewall or any other security software is not blocking VNC traffic through the Ethernet interface. You can try to temporarily disable the firewall for testing.
    3. Make sure your network adapter drivers are up to date. Access Device Manager and check for driver updates for your Ethernet and Wi-Fi adapters.
    4. Check TightVNC settings to make sure it is not configured to use the Wi-Fi interface first.
    5. Try restarting your router and computer.

    If you have tried the above steps and still can't resolve the issue, we suggest you consider rolling back to Windows 11 23H2 and try updating again after a new patch is released.

    I hope the information above is helpful.

    If you have any questions or concerns, please feel free to let us know.

    Regards,

    Jill Zhou

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  2. Anonymous
    2024-12-19T05:28:09+00:00

    Thanks for the input Jill Zhou.

    My use case is I want to keep Wi-Fi interface on higher priority. So normally traffic should go through the Wi-Fi interface which is originating from device.

    But at the same time ethernet interface is also configured. So if I want to access this device remotely from within my network, I want to use ethernet interface instead of Wi-Fi interface.

    My observations are below, when Wi-Fi and Ethernet connected and when I try to VNC from some remote machine to Ethernet IP, I can see some packets are going through Wi-Fi interface even though I have send VNC request on ethernet interface IP, and that is what is creating an issue.

    I found this thread where it says some sort of load balancing, if is there any knob to turn it off I would like to do that.

    O/P of route PRINT

    IPv4 Route Table

    ===========================================================================

    Active Routes:

    Network Destination Netmask Gateway Interface Metric

          0.0.0.0          0.0.0.0      10.81.203.1     10.81.203.26     80

      0.0.0.0          0.0.0.0      10.76.207.1     10.76.207.14     20

  10.76.207.0    255.255.255.0         On-link      10.76.207.14    266

 10.76.207.14  255.255.255.255         On-link      10.76.207.14    266

10.76.207.255  255.255.255.255         On-link      10.76.207.14    266

  10.81.203.0  255.255.255.128         On-link      10.81.203.26    336

 10.81.203.26  255.255.255.255         On-link      10.81.203.26    336

10.81.203.127  255.255.255.255         On-link      10.81.203.26    336

    127.0.0.0        255.0.0.0         On-link         127.0.0.1    331

    127.0.0.1  255.255.255.255         On-link         127.0.0.1    331

    127.255.255.255 255.255.255.255 On-link 127.0.0.1 331

        224.0.0.0        240.0.0.0         On-link         127.0.0.1    331

    224.0.0.0        240.0.0.0         On-link      10.81.203.26    336

    224.0.0.0        240.0.0.0         On-link      10.76.207.14    266

    255.255.255.255 255.255.255.255 On-link 127.0.0.1 331

    255.255.255.255 255.255.255.255 On-link 10.81.203.26 336

    255.255.255.255 255.255.255.255 On-link 10.76.207.14 266

    ===========================================================================

    Persistent Routes:

    None

    IPv6 Route Table

    ===========================================================================

    Active Routes:

    If Metric Network Destination Gateway

    1 331 ::1/128 On-link

    11 336 fe80::/64 On-link

    7 266 fe80::/64 On-link

    11 336 fe80::a4a7:1d5a:78c7:c829/128

                                    On-link

    7 266 fe80::d0df:6c70:5d0b:f05/128

                                    On-link

    1 331 ff00::/8 On-link

    11 336 ff00::/8 On-link

    7 266 ff00::/8 On-link

    ===========================================================================

    Persistent Routes:

    None

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  4. Anonymous
    2024-12-22T04:47:31+00:00

    Even after setting the eth to lower metric, it will still connect to wifi. Here is my route info.

          0.0.0.0          0.0.0.0         10.0.0.1       10.0.0.216    200  
      0.0.0.0        255.0.0.0    192.168.2.254      192.168.2.1     26  
     10.0.0.0    255.255.255.0            On-link        10.0.0.216    356  
   10.0.0.216  255.255.255.255            On-link        10.0.0.216    356  
   10.0.0.255  255.255.255.255            On-link        10.0.0.216    356

    Here 10.0.0.x is my wifi network and 192.168.2.x is my eth network. You can see that the wifi has larger metric, but when I'm copying a file from my nas under the eth network, it will go through wifi. That makes no sense. 23H2 works just fine with the same config.

    Seems that 24h2 has some "smart" metric strategy by prioritizing the network with real ethernet connection which is quite unnecessary.

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  5. Anonymous
    2024-12-23T07:02:58+00:00

    Looks like it is BUG on windows front. They can not just go for some smart metric routing, ignoring user configuration. Not sure right way to raise this as BUG to windows.

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