my virtual machine cannot ping public IPs

amadou diallo 20

Hello guys,

I need help from everyone, my issue is with the public IP addresses that I cannot ping in my virtual machine.

So if anyone can help me with this.

I specified that the public IP address of my firewall is what works on my virtual machine but even that one I cannot ping.

Thank you for your understanding

Andreas Baumgarten 107.3K Reputation points MVP

2024-07-19T19:35:34.31+00:00
Hi @amadou diallo ,

please take a look here:

When is default outbound access provided?

Default outbound constraints

Instead of ping you can use the Test-Connection PowerShell cmdlet:

Test-NetConnection -ComputerName <name or IP> -Port <xy> (e.g. 80 or 53 ,.....)

(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)

Regards

Andreas Baumgarten
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amadou diallo 20 Reputation points

2024-07-19T19:58:06.84+00:00

I tried with that, but it still doesn't work with
KapilAnanth-MSFT 43,656 Reputation points Microsoft Employee

2024-07-22T09:20:28.1966667+00:00
@amadou diallo

Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.

Outbound ICMP Pings are possible only when the VM has a dedicated Public IP attached to it's NIC.

If you are routing traffic via an Azure Firewall, outbound ICMP Pings will not succeed.

See : Azure Firewall known limitations

The recommendation is to instead use TCP Ping (with port) such as Telnet or Test-NetConnection.

For this, the Firewall should have an allow rule configured in the Network Rules for target IP and target Port.

If your requirement is ICMP Ping only, then you should not route traffic via the Azure Firewall and attach a dedicated Public IP to the VM

NOTE : NAT gateway also cannot assist you with ICMP Ping.

Thanks,

Kapil

Please Accept an answer if correct.

Original posters help the community find answers faster by identifying the correct answer.
KapilAnanth-MSFT 43,656 Reputation points Microsoft Employee

2024-07-24T07:59:38.6166667+00:00
@amadou diallo ,

If your requirement is ICMP Ping only, then you should not route traffic via the Azure Firewall.

Instead attach a dedicated Public IP to the VM and directly access the internet

However, the recommendation is to use TCP Ping in Azure for any internet bound traffic.

For TCP Traffic from Windows VMs,

Open Powershell and use Test-NetConnection

The command is Test-NetConnection -ComputerName <FQDN/IP> -Port <PortNumber>

E.g.

Test-NetConnection -ComputerName www.google.com -Port 443

Test-NetConnection -ComputerName 8.8.8.8 -Port 443

Cheers,

Kapil

Please Accept an answer if correct.

Original posters help the community find answers faster by identifying the correct answer.

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