Remote performance is sometimes not good

[9health]

Description

• While working remotely at night by SSH to Azure B1s VM West US, users found that the command line response is slow.

Investigations

Wi-Fi module

• Maybe the Wi-Fi module on the 2014-model laptop of the user has some problems and doesn't work correctly.
  • It may not be the root cause of this problem, remote accesses to internal servers are okay!!!

ISP

• The user's ISP is VNPT, the server is located at the West of U.S, maybe the intercontinental bandwidth is throttled.
  • The latency from Hanoi to West US server is about 170 ms
    • The latency between PCs in LAN is about 1 ms
    • The latency between laptops in WLAN (Wireless LAN) is about 2 ms to 9 ms

Internet modem

• The VNPT GW-040 Wi-Fi router has some problems...

Other complaints

• User said that at night, YouTube loading is very slow while only some devices are connected...
  • Unique users are 2 to 3.
  • It needs to check more.
    • When this happens, the CPU and RAM graph on the modem's home page should be checked!!!

Resolutions

About Internet modem

• Sometimes it needs to reset the modem once per 2 or 3-day.

Another SSH option

• Try to use -C option to compress transmitting and receiving packets through SSH.
  • ssh -C -i ~/.ssh/id_rsa_ninehealth_westus ninehealth@ninehealth.westus.cloudapp.azure.com

VSCode's Integrated Terminal

• Use VSCode with built-in Integrated Terminal.

Cloudflare

• Use Cloudflare WARP
  • https://1.1.1.1

• Use Cloudflare Zerotrust (previously call Cloudflare for Teams)

  • https://blog.cloudflare.com/the-zero-trust-platform-built-for-speed/

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    We’re excited to share how each of these components work together to deliver a comprehensive Zero Trust platform that makes your team faster. All the tools we talk about below are available today, they’re easy to use (and get started with) — and they’re free for your first 50 users. If you want to sign up now, head over to the Teams Dashboard!

Azure

• Use Azure VPN Gateway
  • https://azure.microsoft.com/free/free-account-faq/
  • https://learn.microsoft.com/azure/vpn-gateway/vpn-gateway-about-vpngateways
  • https://learn.microsoft.com/azure/vpn-gateway/vpn-gateway-validate-throughput-to-vnet
• Use Azure Private Link
  • https://azure.microsoft.com/products/private-link/
  • https://learn.microsoft.com/azure/private-link/private-link-overview
• Move Azure VM to Singapore or Taiwan location

Other notes

• Hai has no problem while SSH to this server.

  • Hai's ISP is Viettel and the modem is from Huawei.

• The slow latency is pre-alerted at Section 6.4 Độ trễ khi ping while creating Azure VM

  • The West US location was chosen from an example on Microsoft Learn =.=
    • Because It needs a quick action to start the MovieGEEKs web app.
    • Now it is the consequence...

• Hai does not have much knowledge at setting VPN

  • Maybe trying the Cloudflare WARP and Cloudflare Zerotrust are the best way!!!
    • It is quite easy to setup!!!

Output

• Try some resolutions
• A Wiki page about this problem.

History

• 2023/01/05: Newly create