How to simulate a slow network connection

[IanCH]

Hi

Ok, this might sound like a strange question, especially as my searching has found people trying to solve slow connections and in fact I am trying to create one.

Let me explain.

In the real world there is a server hosting an application and other servers talk to it over the internet. One of those servers is on a very very very slow Internet connection and is having problems.

What I want to do (if possible) is create the two VMs on my test proxmox server. The first VM being the application server and the second VM being the problem server.

I'd like to simulate the very slow network in proxmox by creating a virtual network being the two VMs and then specify the speeds (upload speed and download speed) so I can debug test the application server.

Is this possible? and if so how?

If no, not in proxmox, then do I need a third VM to sit in the middle and run something to simulate slow networks? If so what?

Many thanks in advance

 

[bbgeek17]

You would do it inside the VM, depending on what OS you are running the means will be different.
Plug this into google: "network link latency simulator linux"

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Blockbridge : Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox

 

[IanCH]

Many thanks @bbgeek17

Both VMs running Debian 11

Following your suggested Google I found this article (Adding simulated network latency to your Linux server) which looks like it will do nicely

 

[leesteken]

I was experimenting with usbip (USB over the network) recently and to see the effect of a slow connection I just set the virtual Network device's Rate Limit (MB/s) to 0.01.

 

[IanCH]

@leesteken cool.

That will work nicely too. Many thanks