capstats(8) print statistics about the current load on a network interface


capstats [ options ] -i interface


This manual page documents briefly the capstats command.

capstats is a program that prints statistics about the current load on a network interface using libpcap. It reports statistics per time interval and/or for the tool's total run-time.

Here's an example output with output in one-second intervals until CTRL-C is hit:

>capstats -i eth0 -I 1
1186620936.890567 pkts=12747 kpps=12.6 kbytes=10807 mbps=87.5 nic_pkts=12822 nic_drops=0 u=960 t=11705 i=58 o=24 nonip=0
1186620937.901490 pkts=13558 kpps=13.4 kbytes=11329 mbps=91.8 nic_pkts=13613 nic_drops=0 u=1795 t=24339 i=119 o=52 nonip=0
1186620938.912399 pkts=14771 kpps=14.6 kbytes=13659 mbps=110.7 nic_pkts=14781 nic_drops=0 u=2626 t=38154 i=185 o=111 nonip=0
1186620939.012446 pkts=1332 kpps=13.3 kbytes=1129 mbps=92.6 nic_pkts=1367 nic_drops=0 u=2715 t=39387 i=194 o=112 nonip=0
=== Total
1186620939.012483 pkts=42408 kpps=13.5 kbytes=36925 mbps=96.5 nic_pkts=1 nic_drops=0 u=2715 t=39387 i=194 o=112 nonip=0


These programs follow the usual GNU command line syntax, with long options starting with two dashes (`-'). A summary of options is included below.

-i, --interface interface
Listen on interface

-d, --dag
Use native DAG API if capstats was built with DAG support.

-f, --filter filter
BPF filter

-I, --interval secs
Stats logging interval

-l, --syslog
Use syslog rather than print to stderr
-n, --number count
Stop after outputting count intervals

-p, --payload n
Verifies that packets' payloads consist entirely of bytes of the given value.

-q, --quiet count
Suppress output, exit code indicates >= count packets received.

-S, --size size
Verify packets to have given size

-s, --snaplen size
Use pcap snaplen size

-v, --version
Print version and exit

-w, --write filename
Write packets to filename


capstats was written by Robin Sommer <[email protected]>

This manual page was written by Justin Azoff <[email protected]>, for the Debian project (but may be used by others).