> Source: [sk116796](https://support.checkpoint.com/results/sk/sk116796)

# sk116796 - 'tcpdump' utility does not capture the specified traffic on vSEC for NSX / vSEC Virtual Edition Hypervisor Mode

| Property | Value |
|----------|-------|
| Solution ID | sk116796 |
| Date Created | 2017-05-03 |
| Last Modified | 2020-10-26 |
| Technical Level | General |
| OS | Gaia |
| Platform | VMWare ESX |

## Symptoms

- 'tcpdump' utility does not capture the specified traffic on vSEC for NSX / vSEC Virtual Edition Hypervisor Mode

## Cause

'tcpdump' utility captures the traffic at the NIC driver level.

On vSEC for NSX-V / vSEC Virtual Edition Hypervisor Mode, the traffic flow is different than on the physical machine.

## Solution

Capture the traffic using the [Check Point FW Monitor](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk30583), which runs at the kernel level.

---

# Agent Instructions

This content is from the Check Point Support Center (https://support.checkpoint.com), the official knowledge base for Check Point cybersecurity products.

## Navigating This Knowledge Base

- **Complete index**: [llms.txt](https://support.checkpoint.com/llms.txt)
- **All SK articles**: [SecureKnowledge Sitemap](https://support.checkpoint.com/sitemaps/secureknowledge-sitemap-index.xml)
- **SK article URL pattern**: `https://support.checkpoint.com/results/sk/{skId}`
- **Markdown responses**: AI bot User-Agents automatically receive `text/markdown` content