ifstat - Online in the Cloud

PROGRAM:

NAME

ifstat - Report InterFace STATistics

SYNOPSIS

ifstat [-a] [-l] [-z] [-n] [-v] [-h] [-t] [-i if0,if1,...] [-d drv[:opt]] [-s
[comm@][#]host[/nn]] [-T] [-A] [-w] [-W] [-S] [-b] [-q] [delay[/delay] [count]]

DESCRIPTION

Ifstat is a little tool to report interface activity, just like iostat/vmstat do for other
system statistics.

OPTIONS

ifstat accepts the following options:

-l Enables monitoring of loopback interfaces for which statistics are available. By
default, ifstat monitors all non-loopback interfaces that are up.

-a Enables monitoring of all interfaces found for which statistics are available.

-z Hides interface which counters are null, eg interfaces that are up but not used.

-i Specifies the list of interfaces to monitor, separated by commas (if an interface name
has a comma, it can be escaped with '\'). Multiple instances of the options are added
together.

-s Equivalent to -d snmp:[comm@][#]host[/nn]] to poll a remote host through SNMP. See
below for details.

-h Displays a short help message.

-n Turns off displaying the header periodically.

-t Adds a timestamp at the beginning of each line.

-T Reports total bandwith for all monitored interfaces.

-A Disables use of interface indexes: by default, when polling mechanism is index based
(snmp, ifmib), ifstat remembers indexes of monitored interfaces to poll only them.
However, if interfaces indexes change often (new interfaces added, etc), you might
loose some stats, hence this flag. Note that if you ask ifstat to monitor a non
existent interface, it will poll all interfaces until it finds the requested one
(regardless of this flag) so you can poll for an interface that goes up and down.

-w Uses fixed width columns, instead of enlarging them if needed for interfaces names to
fit.

-W Wrap lines that are larger than the terminal width (implies -w). Wrapped lines are
prefixed with a cycling letter to ease reading.

-S Keep stats updated on the same line if possible (no scrolling nor wrapping).

-b Reports bandwith in kbits/sec instead of kbytes/sec.

-q Quiet mode, warnings are not printed.

-v Displays version and the compiled-in drivers.

-d Specifies a driver to use to gather stats and an eventual option for this driver
separated of the driver name by a colon. If this is not specified, ifstat uses the
first driver compiled in, with no options.

The following drivers are available (depending on the operating system and compile-
time options, not all of them might be present):

proc
This driver gets statistics from Linux's /proc/net/dev file. An alternate file
name to get stats from can be passed as the option.

ifmib
This driver gets statistics from FreeBSD's ifmib sysctl. It doesn't accept any
options.

kstat
This driver gets statistics from Solaris kstat interface. It doesn't accept any
options.

ifdata
This driver gets statistics using SIOCGIFDATA ioctl under IRIX and OpenBSD
(different semantics). It doesn't accept any options.

route
This driver gets statistics using routing sysctl on BSD based systems. It doesn't
accept any options.

kvm This driver gets statistics by reading the kernel live structures. It accepts an
option specifying which files/devices to use in the following format :
[execfile][,[corefile][,swapfile]] (see kvm_open(3) for details on those fields).
If a null string is passed for a parameter, the system default will be used for
it.

Note that for this driver to work, ifstat needs to have read access to the system
memory device. This is usually done by running it as root, or by installing setgid
mem or kmem. ifstat will NOT install setgid by default; It is up to you to decide
if you trust it.

dlpi
This driver gets statistics using the DLPI streams interface available on HP-UX.
An alternate device to query statistics from can be passed as the option (default
is /dev/dlpi).

win32
This driver gets statistics using the GetIfTable interface available on Win32
systems. It doesn't accept any options.

snmp
This driver gets statistics through SNMP. The option, in the form
[comm@][#]host[/nn]], specifies the host and eventual community to poll. Default
community is public, but can be changed by prepending "comm@" to the hostname. If
host starts by a #, interface names are generated from their index as `ifNN' (this
is a workaround for some equipments that give all interfaces the same
description). Default host is localhost, and this will be used by default if snmp
is the only available driver.

The driver will try to poll several interfaces at once by grouping requests in
SNMP packets. By default interfaces will be polled by group of 8. If this doesn't
work well with your equipments, you can lower that number by suffixing the
hostname with /nn, where nn is the number of interfaces to poll at once. You can
also increase the number if you want to poll a large number of interfaces
efficiently and if your server supports it.

delay
delay is the delay between updates in seconds, which defaults to 1. A decimal number
can be specified for intervals shorter than a second. (minimum 0.1)

A second delay can also be specified (separated from the first one by a '/'). In that
case the first delay will be used for the first poll after start and the second one
will be used for all following polls (This can be used to have a "fast" start when
running for a long while with a big delay).

count
count is the number of updates before stopping. If not specified, it is unlimited.

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