1FPING(8)                                                              FPING(8)
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NAME

6       fping - send ICMP ECHO_REQUEST packets to network hosts
7

SYNOPSIS

9       fping [ options ] [ systems... ]
10

DESCRIPTION

12       fping is a program like ping which uses the Internet Control Message
13       Protocol (ICMP) echo request to determine if a target host is
14       responding.  fping differs from ping in that you can specify any number
15       of targets on the command line, or specify a file containing the lists
16       of targets to ping.  Instead of sending to one target until it times
17       out or replies, fping will send out a ping packet and move on to the
18       next target in a round-robin fashion.  In the default mode, if a target
19       replies, it is noted and removed from the list of targets to check; if
20       a target does not respond within a certain time limit and/or retry
21       limit it is designated as unreachable. fping also supports sending a
22       specified number of pings to a target, or looping indefinitely (as in
23       ping ). Unlike ping, fping is meant to be used in scripts, so its
24       output is designed to be easy to parse.
25

OPTIONS

27       -4, --ipv4
28            Restrict name resolution and IPs to IPv4 addresses.
29
30       -6, --ipv6
31            Restrict name resolution and IPs to IPv6 addresses.
32
33       -a, --alive
34            Show systems that are alive.
35
36       -A, --addr
37            Display targets by address rather than DNS name. Combined with -d,
38            the output will be both the ip and (if available) the hostname.
39
40       -b, --size=BYTES
41            Number of bytes of ping data to send.  The minimum size (normally
42            12) allows room for the data that fping needs to do its work
43            (sequence number, timestamp).  The reported received data size
44            includes the IP header (normally 20 bytes) and ICMP header (8
45            bytes), so the minimum total size is 40 bytes.  Default is 56, as
46            in ping. Maximum is the theoretical maximum IP datagram size
47            (64K), though most systems limit this to a smaller, system-
48            dependent number.
49
50       -B, --backoff=N
51            Backoff factor. In the default mode, fping sends several requests
52            to a target before giving up, waiting longer for a reply on each
53            successive request.  This parameter is the value by which the wait
54            time (-t) is multiplied on each successive request; it must be
55            entered as a floating-point number (x.y). The default is 1.5.
56
57       -c, --count=N
58            Number of request packets to send to each target.  In this mode, a
59            line is displayed for each received response (this can suppressed
60            with -q or -Q).  Also, statistics about responses for each target
61            are displayed when all requests have been sent (or when
62            interrupted).
63
64       -C, --vcount=N
65            Similar to -c, but the per-target statistics are displayed in a
66            format designed for automated response-time statistics gathering.
67            For example:
68
69             $ fping -C 5 -q somehost
70             somehost : 91.7 37.0 29.2 - 36.8
71
72            shows the response time in milliseconds for each of the five
73            requests, with the "-" indicating that no response was received to
74            the fourth request.
75
76       -d, --rdns
77            Use DNS to lookup address of return ping packet. This allows you
78            to give fping a list of IP addresses as input and print hostnames
79            in the output. This is similar to option -n/--name, but will force
80            a reverse-DNS lookup even if you give hostnames as target
81            (NAME->IP->NAME).
82
83       -D, --timestamp
84            Add Unix timestamps in front of output lines generated with in
85            looping or counting modes (-l, -c, or -C).
86
87       -e, --elapsed
88            Show elapsed (round-trip) time of packets.
89
90       -f, --file
91            Read list of targets from a file.  This option can only be used by
92            the root user. Regular users should pipe in the file via stdin:
93
94             $ fping < targets_file
95
96       -g, --generate addr/mask
97            Generate a target list from a supplied IP netmask, or a starting
98            and ending IP.  Specify the netmask or start/end in the targets
99            portion of the command line. If a network with netmask is given,
100            the network and broadcast addresses will be excluded. ex. To ping
101            the network 192.168.1.0/24, the specified command line could look
102            like either:
103
104             $ fping -g 192.168.1.0/24
105
106            or
107
108             $ fping -g 192.168.1.1 192.168.1.254
109
110       -h, --help
111            Print usage message.
112
113       -H, --ttl=N
114            Set the IP TTL field (time to live hops).
115
116       -i, --interval=MSEC
117            The minimum amount of time (in milliseconds) between sending a
118            ping packet to any target (default is 10, minimum is 1).
119
120       -I, --iface=IFACE
121            Set the interface (requires SO_BINDTODEVICE support).
122
123       -l, --loop
124            Loop sending packets to each target indefinitely. Can be
125            interrupted with Ctrl-C; statistics about responses for each
126            target are then displayed.
127
128       -m, --all
129            Send pings to each of a target host's multiple IP addresses (use
130            of option '-A' is recommended).
131
132       -M, --dontfrag
133            Set the "Don't Fragment" bit in the IP header (used to
134            determine/test the MTU).
135
136       -n, --name
137            If targets are specified as IP addresses, do a reverse-DNS lookup
138            on them to
139
140       -N, --netdata
141            Format output for netdata (-l -Q are required). See:
142            <http://my-netdata.io/>
143
144       -o, --outage
145            Calculate "outage time" based on the number of lost pings and the
146            interval used (useful for network convergence tests).
147
148       -O, --tos=N
149            Set the typ of service flag (TOS). N can be either decimal or
150            hexadecimal (0xh) format.
151
152       -p, --period=MSEC
153            In looping or counting modes (-l, -c, or -C), this parameter sets
154            the time in milliseconds that fping waits between successive
155            packets to an individual target. Default is 1000 and minimum is
156            10.
157
158       -q, --quet
159            Quiet. Don't show per-probe results, but only the final summary.
160            Also don't show ICMP error messages.
161
162       -Q, --squiet=SECS
163            Like -q, but show summary results every n seconds.
164
165       -r, --retry=N
166            Retry limit (default 3). This is the number of times an attempt at
167            pinging a target will be made, not including the first try.
168
169       -R, --random
170            Instead of using all-zeros as the packet data, generate random
171            bytes.  Use to defeat, e.g., link data compression.
172
173       -s, --src
174            Print cumulative statistics upon exit.
175
176       -S, --src=addr
177            Set source address.
178
179       -t, --timeout=MSEC
180            Initial target timeout in milliseconds. In the default, non-loop
181            mode, the default timeout is 500ms, and it represents the amount
182            of time that fping waits for a response to its first request.
183            Successive timeouts are multiplied by the backoff factor specified
184            with -B.
185
186            In loop/count mode, the default timeout is automatically adjusted
187            to match the "period" value (but not more than 2000ms). You can
188            still adjust the timeout value with this option, if you wish to,
189            but note that setting a value larger than "period" produces
190            inconsistent results, because the timeout value can be respected
191            only for the last ping.
192
193            Also note that any received replies that are larger than the
194            timeout value, will be discarded.
195
196       -T n Ignored (for compatibility with fping 2.4).
197
198       -u, --unreach
199            Show targets that are unreachable.
200
201       -v, --version
202            Print fping version information.
203

EXAMPLES

205       Generate 20 pings to two hosts in ca. 1 second (i.e. one ping every 50
206       ms to each host), and report every ping RTT at the end:
207
208        $ fping --quiet --interval=1 --vcount=20 --period=50 127.0.0.1 127.0.0.2
209

AUTHORS

211       ·   Roland J. Schemers III, Stanford University, concept and versions
212           1.x
213
214       ·   RL "Bob" Morgan, Stanford University, versions 2.x
215
216       ·   David Papp, versions 2.3x and up
217
218       ·   David Schweikert, versions 3.0 and up
219
220       fping website: <http://www.fping.org>
221

DIAGNOSTICS

223       Exit status is 0 if all the hosts are reachable, 1 if some hosts were
224       unreachable, 2 if any IP addresses were not found, 3 for invalid
225       command line arguments, and 4 for a system call failure.
226

RESTRICTIONS

228       If fping was configured with "--enable-safe-limits", the following
229       values are not allowed for non-root users:
230
231       ·   -i n, where n < 1 msec
232
233       ·   -p n, where n < 10 msec
234

SEE ALSO

236       ping(8)
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238
239
240fping                             2017-04-23                          FPING(8)
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