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articles/network-watcher/packet-capture-overview.md

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# Packet capture overview
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Azure Network Watcher packet capture allows you to create packet capture sessions to track traffic to and from a virtual machine (VM) or a scale set. Packet capture helps to diagnose network anomalies both reactively and proactively. Other uses include gathering network statistics, gaining information on network intrusions, debugging client-server communications and more.
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Azure Network Watcher packet capture allows you to create packet capture sessions to track traffic to and from a virtual machine (VM) or a scale set. Packet capture helps to diagnose network anomalies both reactively and proactively. Other uses include gathering network statistics, gaining information on network intrusions, debugging client-server communications, and more.
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Packet capture is an extension that is remotely started through Network Watcher. This capability saves time and eases the burden of running a packet capture manually on the desired virtual machine or virtual machine scale set instances.
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> Continuous packet capture is currently in PREVIEW.
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> See the [Supplemental Terms of Use for Microsoft Azure Previews](https://azure.microsoft.com/support/legal/preview-supplemental-terms/) for legal terms that apply to Azure features that are in beta, preview, or otherwise not yet released into general availability.
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Continuous packet capture allows you to persistently monitor network traffic using a ring buffer–based mechanism. Unlike standard packet captures that stop after reaching a specific time or file size, continuous capture is designed to run over extended durations, making it ideal for diagnosing intermittent or long-tail issues. Currently, you can configure continuous packet capture using the [Azure Portal](packet-capture-manage.md?tabs=portal#start-a-packet-capture)
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Continuous packet capture allows you to persistently monitor network traffic using a ring buffer–based mechanism. Unlike standard packet captures that stop after reaching a specific time or file size, continuous capture is designed to run over extended durations, making it ideal for diagnosing intermittent or long-tail issues. Currently, you can configure continuous packet capture using the [Azure portal](packet-capture-manage.md?tabs=portal#start-a-packet-capture)
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### How it works
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- Once the file count limit is reached, the oldest file is automatically deleted to allow space for new packets, maintaining a continuous stream of recent data.
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- The capture runs for the user-specified time duration, or a maximum of 7 days, whichever is earlier.
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- The capture runs for the user-specified time duration, or a maximum of seven days, whichever is earlier.
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This ring buffer–style storage helps reduce manual intervention and avoid excessive storage consumption while ensuring that recent traffic is always available for review.
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| Property | Description |
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| -------- | ----------- |
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| **Maximum bytes per packet (bytes)** | The number of bytes from each packet. All bytes are captured if left blank. Enter 34 if you only need to capture IPv4 header. |
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| **Time limit per session (seconds)** | Packet capture session time limit, once the value is reached the session ends. The default value is 18000 seconds (5 hours). |
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| **Time limit per session (seconds)** | Packet capture session time limit. Once the value is reached, the session ends. The default value is 18000 seconds (5 hours). |
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If you're using continuous capture (preview), use the following options to control the size of captured data:
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| **Maximum bytes per packet (bytes)** | The number of bytes from each packet. All bytes are captured if left blank or set to 0. Enter 34 if you only need to capture IPv4 header. |
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| **New files created** | Total files that can be created. The default value is 10. The maximum value is 10,000.|
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| **Bytes per file** | Total number of bytes per file. The default value is 100 MB. The maximum value is 4 GB. |
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| **Time limit per session (seconds)** | Packet capture session time limit, once the value is reached the session ends. The default value is 86400 seconds (1 day). The maximum value is 604800 seconds (7 days). |
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| **Time limit per session (seconds)** | Packet capture session time limit. Once the value is reached, the session ends. The default value is 86400 seconds (1 day). The maximum value is 604800 seconds (7 days). |
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## Filtering (optional)
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### Continuous capture considerations
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In addition to the above considerations, keep the following in mind when using continuous packet capture (preview):
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In addition to the previous considerations, keep the following considerations in mind when using continuous packet capture (preview):
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- Continuous capture is available only for supported VM and VMSS SKUs and regions.
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- The target VM must have sufficient space, or the connected storage account must have appropriate quota to accommodate capture data.
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- Captures with high packet volumes may generate large data sizes quickly. Choose file size and count accordingly to manage buffer length and retention.
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- Captures with high packet volumes might generate large data sizes quickly. Choose file size and count accordingly to manage buffer length and retention.
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## Related content
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