fping Information Gathering Tools
fping is a program like ping which uses the
Internet Control Message Protocol ( ICMP ) echo request to determine
if a target host is responding. fping differs from ping in
that you can specify any number of targets on the command line, or specify a
file containing the lists of targets to ping. Instead of sending to one target
until it times out or replies, fping will send out a ping packet and
move on to the next target in a round-robin fashion. In the default mode, if a
target replies, it is noted and removed from the list of targets to check; if a
target does not respond within a certain time limit and/or retry limit it is
designated as unreachable. fping also supports sending a specified
number of pings to a target, or looping indefinitely (as in ping ).
Unlike ping, fping is meant to be used in scripts, so its output
is designed to be easy to parse.
−4, −−ipv4
Restrict
name resolution and IPs to IPv4 addresses.
$ fping −4 (Target IP)
−6, −−ipv6
Restrict
name resolution and IPs to IPv6 addresses.
$ fping −6 (Target IP)
−a, −−alive
Show
systems that are alive.
−A, −−addr
Display
targets by address rather than DNS name. Combined with −d, the output will be both the
ip and (if available) the hostname.
−b, −−size= BYTES
Number
of bytes of ping data to send. The minimum size (normally 12) allows room for
the data that fping needs to do its work (sequence number,
timestamp). The reported received data size includes the IP header (normally 20 bytes) and ICMP header
(8 bytes), so the minimum total size is 40 bytes. Default is 56, as in ping.
Maximum is the theoretical maximum IP datagram size (64K), though most systems limit this
to a smaller, system-dependent number.
−B, −−backoff=N
Backoff
factor. In the default mode, fping sends several requests to a
target before giving up, waiting longer for a reply on each successive request.
This parameter is the value by which the wait time (−t) is multiplied on
each successive request; it must be entered as a floating-point number (x.y).
The default is 1.5.
−c, −−count=N
Number
of request packets to send to each target. In this mode, a line is displayed
for each received response (this can suppressed with −q or −Q).
Also, statistics about responses for each target are displayed when all
requests have been sent (or when interrupted).
−C, −−vcount=N
Similar
to −c, but the per-target statistics are displayed in a format
designed for automated response-time statistics gathering. For example:
$
fping −C 5 −q somehost
somehost : 91.7 37.0 29.2 − 36.8
shows
the response time in milliseconds for each of the five requests, with the "−" indicating
that no response was received to the fourth request.
−d, −−rdns
Use DNS to lookup address of return ping
packet. This allows you to give fping a list of IP addresses as input and print hostnames
in the output. This is similar to option −n/−−name, but will
force a reverse-DNS lookup even if you give hostnames as target ( NAME− > IP− > NAME ).
−D, −−timestamp
Add
Unix timestamps in front of output lines generated with in looping or counting
modes (−l, −c, or −C).
−e, −−elapsed
Show
elapsed (round-trip) time of packets.
−f, −−file
Read
list of targets from a file. This option can only be used by the root user.
Regular users should pipe in the file via stdin:
$
fping < targets_file
−g, −−generate addr/mask
Generate
a target list from a supplied IP netmask, or a starting and ending IP. Specify the netmask or start/end in the
targets portion of the command line. If a network with netmask is given, the
network and broadcast addresses will be excluded. ex. To ping the network
192.168.1.0/24, the specified command line could look like either:
$
fping −g 192.168.1.0/24
or
$
fping −g 192.168.1.1 192.168.1.254
−h, −−help
Print
usage message.
−H, −−ttl=N
Set
the IP TTL field
(time to live hops).
−i, −−interval= MSEC
The
minimum amount of time (in milliseconds) between sending a ping packet to any
target (default is 10, minimum is 1).
−I, −−iface= IFACE
Set
the interface (requires SO_BINDTODEVICE support).
−l, −−loop
Loop
sending packets to each target indefinitely. Can be interrupted with Ctrl-C;
statistics about responses for each target are then displayed.
−m, −−all
Send
pings to each of a target host’s multiple IP addresses (use of option ’−A’ is recommended).
−M, −−dontfrag
Set
the "Don’t Fragment" bit in the IP header (used to determine/test the MTU ).
−n, −−name
If
targets are specified as IP addresses, do a reverse-DNS lookup on them to
−N, −−netdata
Format
output for netdata (−l −Q are required). See: <http://my−netdata.io/>
−o, −−outage
Calculate
"outage time" based on the number of lost pings and the interval used
(useful for network convergence tests).
−O, −−tos=N
Set
the typ of service flag ( TOS ). N can be either decimal or
hexadecimal (0xh) format.
−p, −−period= MSEC
In
looping or counting modes (−l, −c, or −C), this
parameter sets the time in milliseconds that fping waits
between successive packets to an individual target. Default is 1000 and minimum
is 10.
−q, −−quet
Quiet.
Don’t show per-probe results, but only the final summary. Also don’t show ICMP error
messages.
−Q, −−squiet= SECS
Like −q,
but show summary results every n seconds.
−r, −−retry=N
Retry
limit (default 3). This is the number of times an attempt at pinging a target
will be made, not including the first try.
−R, −−random
Instead
of using all-zeros as the packet data, generate random bytes. Use to defeat,
e.g., link data compression.
−s, −−src
Print
cumulative statistics upon exit.
−S, −−src=addr
Set
source address.
−t, −−timeout= MSEC
Initial
target timeout in milliseconds. In the default, non-loop mode, the default
timeout is 500ms, and it represents the amount of time that fping waits
for a response to its first request. Successive timeouts are multiplied by the
backoff factor specified with −B.
In
loop/count mode, the default timeout is automatically adjusted to match the
"period" value (but not more than 2000ms). You can still adjust the
timeout value with this option, if you wish to, but note that setting a value
larger than "period" produces inconsistent results, because the
timeout value can be respected only for the last ping.
Also
note that any received replies that are larger than the timeout value, will be
discarded.
|
−T n |
Ignored
(for compatibility with fping 2.4). |
−u, −−unreach
Show
targets that are unreachable.
−v, −−version
Print fping version
information.
EXAMPLES
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