ICMP problem

DHIA AHMED 1 Reputation point
2021-09-20T10:18:49.363+00:00

I have site to site VPN network. My problem is that, when I do ping between PCs form site to site the ping works only between PCs with any windows os other than windows 10.

Note: when I do ping form the local network to windows 10 it works. Windows 10 only allows ping from the local subnet !

Can you help me with that ?

Windows 10 Network
Windows 10 Network
Windows 10: A Microsoft operating system that runs on personal computers and tablets.Network: A group of devices that communicate either wirelessly or via a physical connection.
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  1. Limitless Technology 39,466 Reputation points
    2021-09-20T12:42:29.033+00:00

    Hello @DHIA AHMED

    If the issue is specifically with Windows 10 and other things like firewalls and routing has been checked, also assuming that this is a hostname ping, not IP, there are 2 settings in the registry of Windows you can test. These are specific to Windows 10, which would explain the behavior:

    (*always take a backup of your registry before applying any changes)

    DisableSmartNameResolution (DWORD)

    In registry key HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows NT\DNSClient.
    The value is 1 to disable, 0 to enable smart resolution.

    DisableParallelAandAAAA (DWORD)

    In registry key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Dnscache\Parameters.
    The value is 0 to enable, 1 to disable DNS A and AAAA queries from executing in parallel on all configured DNS servers, with the fastest response being theoretically accepted first.

    Otherwise, I would ask you to take a traceroute, nslookup, between 2 affected machines, to see if there is any other routing involved.

    Hope it helps!
    Best regards,

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  2. Dave Patrick 426.3K Reputation points MVP
    2021-09-20T13:23:53.967+00:00

    I'd check these are Enabled for the network profile your connection uses.

    133671-image.png

    --please don't forget to upvote and Accept as answer if the reply is helpful--

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  3. DHIA AHMED 1 Reputation point
    2021-09-20T14:24:27.473+00:00

    Thank you all for the fast reply.
    unfortunately, Neither the first nor the second answer solved my problem. I still can't ping any windows 10 PCs. The ping is working between devices on both sites except windows 10 devices.
    NOTE: The version of windows 10 is 2004


  4. Limitless Technology 39,466 Reputation points
    2021-09-20T16:33:59.073+00:00

    Hello again,

    Also, best thing is to check connectivity,

    Go to Azure --->>Network Watcher's,--->>IP Flow verify

    enter source and destination of windows 10 machine.

    Also did you change the Firewall rule (IcMP) both in Azure as well as in Windows 10 machine ?

    I recommend you to cross check NSG, try by allowing port 3389 and take RDP

    --please don't forget to upvote and Accept as answer if the reply is helpful--

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