Usage: fping [options] [targets...] Probing options: -4, --ipv4 only ping IPv4 addresses -6, --ipv6 only ping IPv6 addresses -b, --size=BYTES amount of ping data to send, in bytes (default: 56) -B, --backoff=N set exponential backoff factor to N (default: 1.5) -c, --count=N count mode: send N pings to each target -f, --file=FILE read list of targets from a file ( - means stdin) -g, --generate generate target list (only if no -f specified) (give start and end IP in the target list, or a CIDR address) (ex. fping -g 192.168.1.0 192.168.1.255 or fping -g 192.168.1.0/24) -H, --ttl=N set the IP TTL value (Time To Live hops) -I, --iface=IFACE bind to a particular interface -l, --loop loop mode: send pings forever -m, --all use all IPs of provided hostnames (e.g. IPv4 and IPv6), use with -A -M, --dontfrag set the Don't Fragment flag -O, --tos=N set the type of service (tos) flag on the ICMP packets -p, --period=MSEC interval between ping packets to one target (in ms) (in loop and count modes, default: 1000 ms) -r, --retry=N number of retries (default: 3) -R, --random random packet data (to foil link data compression) -S, --src=IP set source address -t, --timeout=MSEC individual target initial timeout (default: 500 ms, except with -l/-c/-C, where it's the -p period up to 2000 ms) Output options: -a, --alive show targets that are alive -A, --addr show targets by address -C, --vcount=N same as -c, report results in verbose format -d, --rdns show targets by name (force reverse-DNS lookup) -D, --timestamp print timestamp before each output line -e, --elapsed show elapsed time on return packets -i, --interval=MSEC interval between sending ping packets (default: 10 ms) -n, --name show targets by name (reverse-DNS lookup for target IPs) -N, --netdata output compatible for netdata (-l -Q are required) -o, --outage show the accumulated outage time (lost packets * packet interval) -q, --quiet quiet (don't show per-target/per-ping results) -Q, --squiet=SECS same as -q, but add interval summary every SECS seconds -s, --stats print final stats -u, --unreach show targets that are unreachable -v, --version show version -x, --reachable=N shows if >=N hosts are reachable or not