ICMP problem

Question

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 ?

Answer 1

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,

Answer 2

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

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Answer 3

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

Answer 4

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--