iftop

iftop
Developer(s)	Paul Warren
Initial release	March 2, 2002; 19 years ago
Stable release	0.17
Repository	https://code.blinkace.com/pdw/iftop
Written in	C
Operating system	Unix-like
Type	Bandwidth usage / System monitor
License	GNU General Public License
Website	www.ex-parrot.com/pdw/iftop/

iftop is a free software command-line system monitor tool that produces a frequently updated list of network connections.^[2] By default, the connections are ordered by bandwidth usage, with only the "top" bandwidth consumers shown.

The iftop website gives the following description: "iftop does for network usage what top(1) does for CPU usage. It listens to network traffic on a named interface and displays a table of current bandwidth usage by pairs of hosts. Handy for answering the question 'why is our ADSL link so slow?'".

Description[]

iftop monitors network traffic and displays a table of current bandwidth usage. An interface may be specified or, if not, it will listen on the first interface it finds which looks like an external interface (with libpcap and ). iftop must be run with sufficient permissions to monitor all network traffic; on most systems this means that it must be run as a root user, see sudo.^[3]

By default, iftop will look up hostnames associated with addresses and counts all IP packets that pass through the filter. Hostname look-up can add substantial traffic, in and of itself, and may result in an inaccurate display of network traffic. You may wish to suppress display of DNS traffic by using filter code such as "not port domain", or switch it off entirely, by using the -n option or by pressing "n" when the program is running. Using the -F option makes it possible to show packets entering and leaving a given network.

References[]

^ https://code.blinkace.com/pdw/iftop/raw/master/ChangeLog
^ http://static.usenix.org/event/lisa08/tech/full_papers/theocharides/theocharides_html/
^ Lakshmipriya (January 2016). "A Novel Approach for Performance and Security Enhancement during Live Migration". Indian Journal of Science and Technology. 9 (4). doi:10.17485/ijst/2016/v9i4/87031.

External links[]

Official website

[1] ttps://code.blinkace.com/pdw/iftop/raw/master/ChangeLog

[2] ttp://static.usenix.org/event/lisa08/tech/full_papers/theocharides/theocharides_html/

[3] Lakshmipriya (January 2016). "A Novel Approach for Performance and Security Enhancement during Live Migration". Indian Journal of Science and Technology. 9 (4). doi:10.17485/ijst/2016/v9i4/87031.

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v t Unix command-line interface programs and shell builtins
File system	cat chmod chown chgrp cksum cmp cp dd du df file fuser ln ls mkdir mv pax pwd rm rmdir split tee touch type umask
Processes	at bg crontab fg kill nice ps time
User environment	env exit logname mesg talk tput uname who write
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Shell builtins	alias cd echo test unset wait
Searching	find grep
Documentation	man
Software development	ar ctags lex make nm strip yacc
Miscellaneous	bc cal expr lp od sleep true and false
Categories Standard Unix programs Unix SUS2008 utilities List

iftop

Contents

Description[]

See also[]

References[]

External links[]