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Copy file name to clipboardExpand all lines: articles/virtual-network/virtual-network-test-latency.md
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@@ -21,7 +21,7 @@ Many other common network latency test tools, such as Ping, don't measure TCP or
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Latte and SockPerf measure only TCP or UDP payload delivery times. These tools use the following approach to measure network latency between two physical or virtual computers:
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1. Create a two-way communications channel between the computers by designating one as sender and one as receiver.
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1. Create a two-way communication channel between the computers by designating one as sender and one as receiver.
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1. Send and receive packets in both directions and measure the round-trip time (RTT).
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## Tips and best practices to optimize network latency
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1. Test the effects on network latency of changing any of the following components:
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- Operating system (OS) or network stack software, including configuration changes.
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- VM deployment method, such as deploying to an availability zone or proximity placement group (PPG).
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- VM deployment methods, such as deploying to an availability zone or proximity placement group (PPG).
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- VM properties, such as Accelerated Networking or size changes.
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- Virtual network configuration, such as routing or filtering changes.
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## Test VMs with Latte or SockPerf
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Use the following procedures to install and test network latency with [Latte](https://github.com/mellanox/sockperf) for Windows or [SockPerf](https://github.com/mellanox/sockperf) for Linux.
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Use the following procedures to install and test network latency with [Latte](https://github.com/microsoft/latte) for Windows or [SockPerf](https://github.com/mellanox/sockperf) for Linux.
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# [Windows](#tab/windows)
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### Install Latte and configure VMs
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1.[Download the latest version of latte.exe](https://github.com/microsoft/latte/releases/download/v0/latte.exe) to both VMs, into a separate folder such as *c:\\tools*.
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1.[Download the latest version of latte.exe](https://github.com/microsoft/latte/releases/latest/download/latte.exe) to both VMs and put it in a separate folder such as *c:/tools*.
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1. On the *receiver* VM, create a Windows Defender Firewall `allow` rule to allow the Latte traffic to arrive. It's easier to allow the *latte.exe* program by name than to allow specific inbound TCP ports. In the command, replace the `<path>` placeholder with the path you downloaded *latte.exe* to, such as *c:\\tools\\*.
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The following example shows the command for a VM with an IP address of `10.0.0.4`:<br><br>`latte -a 10.0.0.4:5005 -i 65100`
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1. On the *sender* VM, run the same command as on the receiver, except with `-c` added to indicate the *client* or sender VM. Again replace the `<receiver IP address>`, `<port>`, and `<iterations>` placeholders with your own values.
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1. On the *sender* VM, run the same command as on the receiver, except with `-c` added to indicate the *client* or sender VM. Again, replace the `<receiver IP address>`, `<port>`, and `<iterations>` placeholders with your own values.
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```cmd
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latte -c -a <receiver IP address>:<port> -i <iterations>
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