tcpdump: Difference between revisions
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| -W || Limit the limit the number of files, use with -C. | | -W || Limit the limit the number of files, use with -C. | ||
|- | |||
| -w || Output file name. | |||
|} | |} | ||
=== List all interfaces === | === List all interfaces === | ||
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# tcpdump -D | # tcpdump -D | ||
</syntaxhighlight> | </syntaxhighlight> | ||
=== File size and file limits === | === File, file size, and file limits === | ||
<syntaxhighlight lang="bash"> | <syntaxhighlight lang="bash"> | ||
# tcpdump -C300 -W4 | # tcpdump -i eth0 -C300 -W4 -w $HOSTNAME-tcpdump.pcap | ||
</syntaxhighlight> | </syntaxhighlight> | ||
[[Category:Commands]] | [[Category:Commands]] | ||
Revision as of 16:26, 10 May 2025
Tcpdump prints out a description of the contents of packets on a network interface that match the boolean expression. Many flags need root permissions to run.
Install
# apt install tcpdump
Flags
| Flag | Description |
|---|---|
| -D | List all interfaces. |
| -i | Interface, eth1, any. |
| -C | Max file size to save, all files will have subsequent numbers. |
| -W | Limit the limit the number of files, use with -C. |
| -w | Output file name. |
List all interfaces
# tcpdump -D
File, file size, and file limits
# tcpdump -i eth0 -C300 -W4 -w $HOSTNAME-tcpdump.pcap
