Is there any network rules limites the download bandswiths from china mainland to Azure East Asia(HongKong)?

Question

Is there any network rules limites the download bandswiths from china mainland to Azure East Asia(HongKong)?

lian benchi 21

Hello everyone:
I encounter a issue with azure network. Here is my environment:
I have a visual studio subscriptions, and I create a virtual machine, public address on East Asia Region(HongKong).
After provision the resources, I try to test bandswith of virtual machine on my laptop from china mainland(use scp to download and upload files).
the result:

upload: 1.5MB/s
download: 100KB/s（should gt 1MB/s）

For exclude the possibility of my home network issue, I try the test on different vm with different network(china mainland). and the result is the same.

And I use multi-thread download tools(like aria2, IDM etc...), the download speed can increase to 1.5MB/s

there is no firewall or iptables rules on my virtual machine or subscriptions. and the GFW will not limits network traffic from china mainland to HongKong.

So here is my questions: Is there any network rules in Azure to limits the download speed(per tcp sessions) from china mainland?(even with East Asia region)

KapilAnanth-MSFT 49,616 Reputation points Microsoft Employee Moderator

2022-07-28T07:51:03.92+00:00

Hi @lian benchi ,

Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.
I understand that you are checking the download bandwidth of an Azure VM in the Internet

Azure does not provide any SLA on Internet bandwidth.
You have mentioned you created the VM in East Asia Region.
Can you please let us know in which region is the test VM was deployed?

With that said, there are no hardcoded limits on network performance.
The VM will deliver the bandwidth in accordance with its Size's bandwidth performance.

For latency between Azure Regions over Azure back-bone
Refer: https://www.azurespeed.com/Azure/RegionToRegionLatency

With multi-threaded applications, the bandwidth is expected to increase.
The ideal way to test the bandwidth performance of a VM is to run iperf tests (multi-threaded) over a private Network and not via Internet.

Thanks,
Kapil.
lian benchi 21 Reputation points

2022-07-28T08:20:15.053+00:00

Hello Kapil:
thanks for your reply.
Back to your questions:
about regions: It seems like East Asia does not support Avaiable Zones. So there is no Region column in my portal

and My question about bandswith is that downloas speed has only 100KB/s per tcp session, but bandswith can increase by use multi-thread application.
In normal sceneraio, multi-thread bandswith has no important reference value, We frequently use web browser(like chorme, firefox etc..) to explore web resource, and the low speed of per tcp session will influence user expierence.

I used to purcahse other cloud provider's virtual machine in East Asia(like aliyun, tencent cloud.), the download speed from china mainland per tcp session boost vary from 1MB/s to 5MB/s. but with Azure, I can't get the same expierence. so I doult if there any egress limits from china mainland to Azure east asia network..
KapilAnanth-MSFT 49,616 Reputation points Microsoft Employee Moderator

2022-07-28T13:49:25.183+00:00
Hi @lian benchi ,

Thanks for the update.

Ideally, this should not be the case.
There are no bandwidth restrictions on the Platform for any region.

Also, I tried to reproduce your issue, however, I can see speeds up to 3 Mbps from a Linux VM in East Asia with winScp
My client machines were in Central India.

You can try the following to further isolate the issue.

1
Deploy another VM in East Asia in a different Vnet altogether and try to perform the download over the Internet

2

May I ask how you are creating the file share in the VM? Are you using some tools? or is it normal SFTP in Linux?

As other tools(multi-threaded) give better performance(IDM..), you can try to modify the settings on this tool to provide a multi-threaded download

Refer: https://learn.microsoft.com/en-us/azure/virtual-network/virtual-machine-network-throughput

P.S : We recommend that you design applications that are multithreaded for optimum performance.

Thanks,
Kapil.
KapilAnanth-MSFT 49,616 Reputation points Microsoft Employee Moderator

2022-07-29T13:44:07.107+00:00

Hi @lian benchi ,

Can you please update us if the action plan provided was helpful?

Should there be any follow-up questions or concerns, please let us know and we shall try to address them.

Thanks,
Kapil
lian benchi 21 Reputation points

2022-07-30T08:41:19.937+00:00

Hi Kapil:
I tried to deploy different Vm in East Asia, and result is the same.
I use normal SFTP to test download speed per session( and using curl,wget to test webserver like nginx).

It seems this issue is releated to china mainland. I have no clues to go on...
risolis 8,741 Reputation points

2022-07-31T01:54:01.2+00:00

Hi,

Just wanted to give you this article so, you might understand how the storage caching capacity may influence as well.

https://learn.microsoft.com/en-us/azure/virtual-machines/disks-performance

anonymous user-MSFT great docs gathered too : )

Cheers,
KapilAnanth-MSFT 49,616 Reputation points Microsoft Employee Moderator

2022-08-01T04:29:08.547+00:00

Hi @risolis ,

Thank you :)

Accepted answer

1 additional answer

Your answer

KapilAnanth-MSFT 49,616 Reputation points Microsoft Employee Moderator

2022-07-28T07:51:03.92+00:00

Hi @lian benchi ,

Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.
I understand that you are checking the download bandwidth of an Azure VM in the Internet

Azure does not provide any SLA on Internet bandwidth.
You have mentioned you created the VM in East Asia Region.
Can you please let us know in which region is the test VM was deployed?

With that said, there are no hardcoded limits on network performance.
The VM will deliver the bandwidth in accordance with its Size's bandwidth performance.

For latency between Azure Regions over Azure back-bone
Refer: https://www.azurespeed.com/Azure/RegionToRegionLatency

With multi-threaded applications, the bandwidth is expected to increase.
The ideal way to test the bandwidth performance of a VM is to run iperf tests (multi-threaded) over a private Network and not via Internet.

Thanks,
Kapil.
lian benchi 21 Reputation points

2022-07-28T08:20:15.053+00:00

Hello Kapil:
thanks for your reply.
Back to your questions:
about regions: It seems like East Asia does not support Avaiable Zones. So there is no Region column in my portal

and My question about bandswith is that downloas speed has only 100KB/s per tcp session, but bandswith can increase by use multi-thread application.
In normal sceneraio, multi-thread bandswith has no important reference value, We frequently use web browser(like chorme, firefox etc..) to explore web resource, and the low speed of per tcp session will influence user expierence.

I used to purcahse other cloud provider's virtual machine in East Asia(like aliyun, tencent cloud.), the download speed from china mainland per tcp session boost vary from 1MB/s to 5MB/s. but with Azure, I can't get the same expierence. so I doult if there any egress limits from china mainland to Azure east asia network..
KapilAnanth-MSFT 49,616 Reputation points Microsoft Employee Moderator

2022-07-28T13:49:25.183+00:00

Hi @lian benchi ,

Thanks for the update.

Ideally, this should not be the case.
There are no bandwidth restrictions on the Platform for any region.

Also, I tried to reproduce your issue, however, I can see speeds up to 3 Mbps from a Linux VM in East Asia with winScp
My client machines were in Central India.

You can try the following to further isolate the issue.

1
Deploy another VM in East Asia in a different Vnet altogether and try to perform the download over the Internet

2

May I ask how you are creating the file share in the VM? Are you using some tools? or is it normal SFTP in Linux?

As other tools(multi-threaded) give better performance(IDM..), you can try to modify the settings on this tool to provide a multi-threaded download

Refer: https://learn.microsoft.com/en-us/azure/virtual-network/virtual-machine-network-throughput

P.S : We recommend that you design applications that are multithreaded for optimum performance.

Thanks,
Kapil.
KapilAnanth-MSFT 49,616 Reputation points Microsoft Employee Moderator

2022-07-29T13:44:07.107+00:00

Hi @lian benchi ,

Can you please update us if the action plan provided was helpful?

Should there be any follow-up questions or concerns, please let us know and we shall try to address them.

Thanks,
Kapil
lian benchi 21 Reputation points

2022-07-30T08:41:19.937+00:00

Hi Kapil:
I tried to deploy different Vm in East Asia, and result is the same.
I use normal SFTP to test download speed per session( and using curl,wget to test webserver like nginx).

It seems this issue is releated to china mainland. I have no clues to go on...
risolis 8,741 Reputation points

2022-07-31T01:54:01.2+00:00

Hi,

Just wanted to give you this article so, you might understand how the storage caching capacity may influence as well.

https://learn.microsoft.com/en-us/azure/virtual-machines/disks-performance

anonymous user-MSFT great docs gathered too : )

Cheers,
KapilAnanth-MSFT 49,616 Reputation points Microsoft Employee Moderator

2022-08-01T04:29:08.547+00:00

Hi @risolis ,

Thank you :)

Answer 1

msrini-MSFT 9,291 Microsoft Employee

Hi,

I would suggest you to try tracert and see what route it takes to reach Azure edge from your location. It could be your ISP who might introduce this bandwidth rate limits.

Also, if you want a seamless experience to access Azure public endpoints, you can try deploying Express Route Public peering which provides you SLA and you can access public endpoints with better bandwidth.

Regards,
Karthik Srinivas

Answer 2

lian benchi 21

Hi,guys:
Thanks for reply.
It seems like ISP limits the bandwidth from china mainland to Azure East Asia.
Sometimes the bandwidth could be ultra fast, sometimes It is so slow...

KapilAnanth-MSFT 49,616 Reputation points Microsoft Employee Moderator

2022-08-01T04:32:08.523+00:00

Hi @lian benchi ,

Thanks for updating the thread.

As stated by @msrini-MSFT , you can try leveraging Azure Express Route for accessing public services in Azure with optimum latency and performance.

Feel free to let us know should you require further assistance.

Cheers,
Kapil.

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Is there any network rules limites the download bandswiths from china mainland to Azure East Asia(HongKong)?

1 additional answer

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