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Dumpcap (Wireshark) 4.2.5 (v4.2.5rc0-7-ge9965fe30342)
Capture network packets and dump them into a pcapng or pcap file.
See https://www.wireshark.org for more information.
Usage: dumpcap [options] ...
Capture interface:
-i <interface>, --interface <interface>
name or idx of interface (def: first non-loopback),
or for remote capturing, use one of these formats:
rpcap://<host>/<interface>
TCP@<host>:<port>
--ifname <name> name to use in the capture file for a pipe from which
we're capturing
--ifdescr <description>
description to use in the capture file for a pipe
from which we're capturing
-f <capture filter> packet filter in libpcap filter syntax
-s <snaplen>, --snapshot-length <snaplen>
packet snapshot length (def: appropriate maximum)
-p, --no-promiscuous-mode
don't capture in promiscuous mode
-I, --monitor-mode capture in monitor mode, if available
-B <buffer size>, --buffer-size <buffer size>
size of kernel buffer in MiB (def: 2MiB)
-y <link type>, --linktype <link type>
link layer type (def: first appropriate)
--time-stamp-type <type> timestamp method for interface
-D, --list-interfaces print list of interfaces and exit
-L, --list-data-link-types
print list of link-layer types of iface and exit
--list-time-stamp-types print list of timestamp types for iface and exit
--update-interval interval between updates with new packets (def: 100ms)
-d print generated BPF code for capture filter
-k <freq>,[<type>],[<center_freq1>],[<center_freq2>]
set channel on wifi interface
-S print statistics for each interface once per second
-M for -D, -L, and -S, produce machine-readable output
Stop conditions:
-c <packet count> stop after n packets (def: infinite)
-a <autostop cond.> ..., --autostop <autostop cond.> ...
duration:NUM - stop after NUM seconds
filesize:NUM - stop this file after NUM kB
files:NUM - stop after NUM files
packets:NUM - stop after NUM packets
Output (files):
-w <filename> name of file to save (def: tempfile)
-g enable group read access on the output file(s)
-b <ringbuffer opt.> ..., --ring-buffer <ringbuffer opt.>
duration:NUM - switch to next file after NUM secs
filesize:NUM - switch to next file after NUM kB
files:NUM - ringbuffer: replace after NUM files
packets:NUM - ringbuffer: replace after NUM packets
interval:NUM - switch to next file when the time is
an exact multiple of NUM secs
printname:FILE - print filename to FILE when written
(can use 'stdout' or 'stderr')
-n use pcapng format instead of pcap (default)
-P use libpcap format instead of pcapng
--capture-comment <comment>
add a capture comment to the output file
(only for pcapng)
--temp-dir <directory> write temporary files to this directory
(default: /tmp)
Diagnostic output:
--log-level <level> sets the active log level ("critical", "warning", etc.)
--log-fatal <level> sets level to abort the program ("critical" or "warning")
--log-domains <[!]list> comma-separated list of the active log domains
--log-fatal-domains <list>
list of domains that cause the program to abort
--log-debug <[!]list> list of domains with "debug" level
--log-noisy <[!]list> list of domains with "noisy" level
--log-file <path> file to output messages to (in addition to stderr)
Miscellaneous:
-N <packet_limit> maximum number of packets buffered within dumpcap
-C <byte_limit> maximum number of bytes used for buffering packets
within dumpcap
-t use a separate thread per interface
-q don't report packet capture counts
-v, --version print version information and exit
-h, --help display this help and exit
Dumpcap can benefit from an enabled BPF JIT compiler if available.
You might want to enable it by executing:
"echo 1 > /proc/sys/net/core/bpf_jit_enable"
Note that this can make your system less secure!
Example: dumpcap -i eth0 -a duration:60 -w output.pcapng
"Capture packets from interface eth0 until 60s passed into output.pcapng"
Use Ctrl-C to stop capturing at any time.
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