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.

iftop
Developer(s)Paul Warren
Initial releaseMarch 2, 2002 (2002-03-02)[1]
Stable release
0.17
Repositoryhttps://code.blinkace.com/pdw/iftop
Written inC
Operating systemUnix-like
TypeBandwidth usage / System monitor
LicenseGNU General Public License
Websitewww.ex-parrot.com/pdw/iftop/

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 libncurses). 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.

gollark: No, I mean how you would check that they were able to write and speak pre-language.
gollark: I'm not sure how you'd check something like that anyway.
gollark: I don't really follow early human evolution at all.
gollark: I don't know Hebrew at this time, but if it is anything like any natural language ever it isn't regular enough to be meaningfully machine-parseable.
gollark: You just can't conveniently map the vectors to... logical statements, or whatever you want.

See also

References
  1. https://code.blinkace.com/pdw/iftop/raw/master/ChangeLog
  2. http://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. doi:10.17485/ijst/2016/v9i4/87031.
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