Problems with peering between two vnet in different regions

Question

Problems with peering between two vnet in different regions

Hugo Alberto Cabra Alonso 0

I have two subnets, once a East US and another in the Central US, I created pering with the options show below: Screen Shot 2023-04-13 at 3.25.02 PM

Screen Shot 2023-04-13 at 3.25.24 PM

However, I have ping from the subnet the EastUS to subnet in CentralUs, but not from Central US to EastUS Any ideas the issue?

ChaitanyaNaykodi-MSFT 27,461 Reputation points Microsoft Employee Moderator

2023-04-24T16:48:31.8433333+00:00

@Hugo Alberto Cabra Alonso

Just checking in to see if the below answer helped. If this answers your query, please don’t forget to click "Accept the answer" which might be beneficial to other community members reading this thread. And, if you have any further query do let us know.
ChaitanyaNaykodi-MSFT 27,461 Reputation points Microsoft Employee Moderator

2023-05-02T23:25:09.8066667+00:00

@Hugo Alberto Cabra Alonso

Just checking in to see if the below answer helped. If this answers your query, please don’t forget to click "Accept the answer" which might be beneficial to other community members reading this thread. And, if you have any further query do let us know.

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ChaitanyaNaykodi-MSFT 27,461 Reputation points Microsoft Employee Moderator

2023-04-24T16:48:31.8433333+00:00

@Hugo Alberto Cabra Alonso

Just checking in to see if the below answer helped. If this answers your query, please don’t forget to click "Accept the answer" which might be beneficial to other community members reading this thread. And, if you have any further query do let us know.
ChaitanyaNaykodi-MSFT 27,461 Reputation points Microsoft Employee Moderator

2023-05-02T23:25:09.8066667+00:00

@Hugo Alberto Cabra Alonso

Just checking in to see if the below answer helped. If this answers your query, please don’t forget to click "Accept the answer" which might be beneficial to other community members reading this thread. And, if you have any further query do let us know.

Answer 1

@Hugo Alberto Cabra Alonso Thank you for reaching out on the Microsoft Q&A forum. If based on my understanding from your question above you have setup peering between two Vnets located in East US and Central US respectively. You are able to ping from the subnet the EastUS to subnet in CentralUs, but not from Central US to EastUS. Based on the troubleshooting document here

Check the network traffic flows:

Use Connection Troubleshoot and IP flow verify from the source VM to the destination VM to determine whether there is an NSG or UDR that is causing interference in traffic flows.

Take a network trace:

Start a network trace on the destination VM. For Windows, you can use Netsh. For Linux, use TCPDump.
Run TcpPing or PsPing from the source to the destination IP. This is an example of a TcpPing command: tcping64.exe -t <destination VM address> 3389
After the TcpPing is complete, stop the network trace on the destination.
If packets arrive from the source, there is no networking issue. Examine both the VM firewall and the application listening on that port to locate the configuration issue.

If TCPPing is working as expected, then the issue will be only related to ICMP traffic. It will help if you can check if any firewall is blocking this connectivity.

Hope this helps! Please let me know if you need any further assistance. Thank you!

Please "Accept the answer" if the information helped you. This will help us and others in the community as well.

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Problems with peering between two vnet in different regions

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