Packet capture requires a virtual machine extension AzureNetworkWatcherExtension. The captured data is stored in the local disk or a storage blob. Filters are based on 5-tuple (protocol, local IP address, remote IP address, local port, and remote port) information. Filters are provided for the capture session to ensure you capture traffic you want to monitor. One example of how packet capture can be triggered is with Virtual Machine alerts. Packet capture can be triggered through the portal, PowerShell, CLI, or REST API. This capability eases the burden of running a packet capture manually on the desired virtual machine or virtual machine scale set instance/(S), which saves valuable time. Packet capture is an extension that is remotely started through Network Watcher. Other uses include gathering network statistics, gaining information on network intrusions, to debug client-server communications and much more. Packet capture helps to diagnose network anomalies both reactively and proactively. Network Watcher variable packet capture allows you to create packet capture sessions to track traffic to and from a virtual machine. To checkout please visit Manage packet capture in the Azure portal for VMSS Packet capture ia now also available for Virtual Machine Scale Sets.
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