> Source: [sk109278](https://support.checkpoint.com/results/sk/sk109278)

# sk109278 - Tcpdump does not print traffic capture output on screen

| Property | Value |
|----------|-------|
| Solution ID | sk109278 |
| Date Created | 2016-01-02 |
| Last Modified | 2016-01-03 |
| Technical Level | Advanced |
| Products | Security Gateway, Security Management Server |
| Versions | R82.10, R82, R81.20, R82.10, R82, R81.20, R82.20 |
| OS | Gaia |

## Symptoms

- * Using `'tcpdump -i ethX'` shows no - or very little packet output on the screen.
* Pressing 'Ctrl+C' to stop the tcpdump from the previous step causes the command prompt to freeze for several seconds. During that time, no process is observed in 'top' as consuming High CPU.
* When saving the capture to a file with: `'tcpdump -i ethX -w file_name.cap/pcap'` - and afterwards opening the file in Wireshark or with 'tcpdump -r' shows a lot of traffic captured.

## Cause

The interface is handling a lot of traffic - which exceeds the tcpdump default on-screen-printing buffer (1024 KiB).

## Solution

This solution requires authentication. Please log in to view the full solution.

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