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