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NAMEfping - send ICMP ECHO_REQUEST packets to network hosts
SYNOPSISfping [ options ] [ systems... ]
DESCRIPTIONfping is a program like ping which uses the Internet Control Message Protocol (
- -4, --ipv4
- Restrict name resolution and IPs to IPv4 addresses.
- -6, --ipv6
- Restrict name resolution and IPs to IPv6 addresses.
- -a, --alive
- Show systems that are alive.
- -A, --addr
Display targets by address rather than DNSname. 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 IPheader (normally 20 bytes) andICMPheader (8 bytes), so the minimum total size is 40 bytes. Default is 56, as in ping. Maximum is the theoretical maximumIPdatagram 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 DNSto lookup address of return ping packet. This allows you to give fping a list ofIPaddresses 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 IPnetmask, or a starting and endingIP.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
$ fping -g 192.168.1.1 192.168.1.254
- -h, --help
- Print usage message.
- -H, --ttl=N
Set the IP TTLfield (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_BINDTODEVICEsupport).
- -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 IPaddresses (use of option '-A' is recommended).
- -M, --dontfrag
Set the ``Don't Fragment'' bit in the IPheader (used to determine/test theMTU).
- -n, --name
If targets are specified as IPaddresses, do a reverse-DNS lookup on them to
- -N, --netdata
- Format output for netdata (-l -Q are required). See: <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 ICMPerror 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.
EXAMPLESGenerate 20 pings to two hosts in ca. 1 second (i.e. one ping every 50 ms to each host), and report every ping
$ fping --quiet --interval=1 --vcount=20 --period=50 127.0.0.1 127.0.0.2
Roland J. Schemers III,Stanford University, concept and versions 1.x
RL``Bob'' Morgan, Stanford University, versions 2.x
- David Papp, versions 2.3x and up
- David Schweikert, versions 3.0 and up
fping website: <www.fping.org>
DIAGNOSTICSExit status is 0 if all the hosts are reachable, 1 if some hosts were unreachable, 2 if any
RESTRICTIONSIf fping was configured with "--enable-safe-limits", the following values are not allowed for non-root users:
- -i n, where n < 1 msec
- -p n, where n < 10 msec