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-.\" netsniff-ng - the packet sniffing beast
-.\" Copyright 2013 Daniel Borkmann.
-.\" Subject to the GPL, version 2.
-
-.TH IFPPS 8 "03 March 2013" "Linux" "netsniff-ng toolkit"
-.SH NAME
-ifpps \- top-like networking and system statistics
-
-.SH SYNOPSIS
-
-\fB ifpps\fR { [\fIoptions\fR] | [\fIdevice\fR] }
-
-.SH DESCRIPTION
-
-ifpps is a small utility which periodically provides top-like networking
-and system statistics from the kernel. ifpps gathers its data directly
-from procfs files and does not apply any user space monitoring libraries
-which would falsify statistics on high load.
-
-For instance, consider the following scenario: two directly connected
-Linux machines with Intel Core 2 Quad Q6600 2.40GHz CPUs, 4 GB RAM, and
-an Intel 82566DC-2 Gigabit Ethernet NIC are used for performance evaluation.
-One machine generates 64 byte network packets by using the kernel space
-packet generator pktgen with a maximum possible packet rate. The other
-machine displays statistics about incoming network packets by using i)
-iptraf(8) and ii) ifpps.
-
-iptraf that incorporates pcap(3) shows an average packet rate of
-246,000 pps while on the other hand ifpps shows an average packet rate of
-1,378,000 pps. Hence, due to copying packets and deferring statistics
-creation into user space, measurement error of approx. 460 per cent
-occurs. Tools like iptraf might display much more information such as
-TCP per flow statistics (therefore the use of the pcap library), which
-is not implemented in ifpps, because overall networking statistics are
-in our focus; statistics, which are also fairly reliable under high packet
-load.
-
-.SH OPTIONS
-
-.SS -d <netdev>, --dev <netdev>
-Networking device to fetch statistics from, e.g. eth0, wlan0.
-
-.SS -t <time>, --interval <time>
-Statistics refresh interval in milliseconds, default is 1000 ms.
-
-.SS -p, --promisc
-Turn on promiscuous mode for the given networking device.
-
-.SS -c, --csv
-Output (once) the ncurses data to the terminal as gnuplot(1)-ready data.
-
-.SS -l, --loop
-Continuously output the terminal data after a refresh interval. This option
-only is available, if option ``-c'' is given. For ``-l'' it is usually
-recommended to redirect the output into a file that is later being processed
-with gnuplot(1).
-
-.SS -v, --version
-Show versioning information.
-
-.SS -h, --help
-Show user help.
-
-.SH USAGE EXAMPLE
-
-.SS ifpps eth0
-Default ncurses output for the eth0 device.
-
-.SS ifpps -pd eth0
-Ncurses output for the eth0 device in promiscuous mode.
-
-.SS ifpps -lpcd wlan0 > plot.dat
-Continuous terminal output for the wlan0 device in promiscuous mode.
-
-.SH NOTE
-On 10Gbit/s cards or higher, receive and transmit statistics are usually
-accumulated each > 1sec. Thus, it might be advised to alter the timing
-option to a higher accumulation interval for such cards.
-
-.SH BUGS
-Systems with a failry high number of cores (> 32) are currently not
-supported. This should however not be a big deal to fix that. The only
-challenge would be to display the presented information in a sane way,
-probably by selectively hiding uninteresting statistics.
-
-.SH LEGAL
-ifpps is licensed under the GNU GPL version 2.0.
-
-.SH HISTORY
-.B ifpps
-was originally written for the netsniff-ng toolkit by Daniel Borkmann. It
-is currently maintained by Tobias Klauser <tklauser@distanz.ch> and Daniel
-Borkmann <dborkma@tik.ee.ethz.ch>.
-
-.SH SEE ALSO
-.BR netsniff-ng (8),
-.BR trafgen (8),
-.BR mausezahn (8),
-.BR bpfc (8),
-.BR flowtop (8),
-.BR astraceroute (8),
-.BR curvetun (8)
-
-.SH AUTHOR
-Manpage was written by Daniel Borkmann.