1 .\" netsniff-ng - the packet sniffing beast
2 .\" Copyright 2013 Daniel Borkmann.
3 .\" Subject to the GPL, version 2.
5 .TH IFPPS 8 "03 March 2013" "Linux" "netsniff-ng toolkit"
7 ifpps \- top-like networking and system statistics
11 \fB ifpps\fR { [\fIoptions\fR] | [\fIdevice\fR] }
15 ifpps is a small utility which periodically provides top-like networking
16 and system statistics from the kernel. ifpps gathers its data directly
17 from procfs files and does not apply any user space monitoring libraries
18 which would falsify statistics under high load.
20 For instance, consider the following scenario: two directly connected
21 Linux machines with Intel Core 2 Quad Q6600 2.40GHz CPUs, 4 GB RAM, and
22 an Intel 82566DC-2 Gigabit Ethernet NIC are used for performance evaluation.
23 One machine generates 64 byte network packets by using the kernel space
24 packet generator pktgen with a maximum possible packet rate. The other
25 machine displays statistics about incoming network packets by using i)
26 iptraf(8) and ii) ifpps.
28 iptraf which incorporates pcap(3) shows an average packet rate of
29 246,000 pps while on the other hand ifpps shows an average packet rate
30 of 1,378,000 pps. Hence, due to packet copies and deferring statistics
31 creation into user space, a measurement error of approximately 460 per cent
32 occurs. Tools like iptraf might display much more information such as
33 TCP per flow statistics (hence the use of the pcap library), that is not
34 possible with ifpps, because overall networking statistics are our focus;
35 statistics, which are also fairly reliable under high packet load.
39 .SS -d <netdev>, --dev <netdev>
40 Networking device to fetch statistics from, for example, eth0, wlan0.
42 .SS -t <time>, --interval <time>
43 Statistics refresh interval in milliseconds, default is 1000ms.
46 Turn on promiscuous mode for the given networking device.
49 Output (once) the ncurses data to the terminal as gnuplot(1)-ready data.
52 Continuously output the terminal data after a refresh interval. This option
53 is only available, if option \[lq]-c\[rq] is given. For \[lq]-l\[rq] it is usually
54 recommended to redirect the output into a file that is to be be processed
55 later with gnuplot(1).
58 Show version information.
66 Default ncurses output for the eth0 device.
69 Ncurses output for the eth0 device in promiscuous mode.
71 .SS ifpps -lpcd wlan0 > plot.dat
72 Continuous terminal output for the wlan0 device in promiscuous mode.
75 On 10Gbit/s cards or higher, receive and transmit statistics are usually
76 accumulated at a higher duration interval than 1 second. Thus, it might
77 be advisable to alter the timing to a higher accumulation interval for such cards.
80 Systems with greater than 32 cores are currently not supported. This
81 should, however, not be a big task to fix. The only challenge would
82 be to display the presented information in a sane way, probably by
83 selectively hiding uninteresting statistics.
86 ifpps is licensed under the GNU GPL version 2.0.
90 was originally written for the netsniff-ng toolkit by Daniel Borkmann. It
91 is currently maintained by Tobias Klauser <tklauser@distanz.ch> and Daniel
92 Borkmann <dborkma@tik.ee.ethz.ch>.
100 .BR astraceroute (8),
104 Manpage was written by Daniel Borkmann.