Linux 環境で ping や fping を使って通信確認する際、実行回数を指定したり、無制限に（ループして）実行させたい場合があります。 今回はそういった場合のコマンドラインをメモしておきます。 テストは CentOS7 上で実施しました。
ping 編
回数指定で実行する
-c で実行回数、-i で実行間隔、-s でサイズを指定して実行します。
# ping -c 5 -i 0.1 -s 100 172.24.20.253
PING 172.24.20.253 (172.24.20.253) 100(128) bytes of data.
108 bytes from 172.24.20.253: icmp_seq=1 ttl=252 time=0.861 ms
108 bytes from 172.24.20.253: icmp_seq=2 ttl=252 time=0.858 ms
108 bytes from 172.24.20.253: icmp_seq=3 ttl=252 time=0.794 ms
108 bytes from 172.24.20.253: icmp_seq=4 ttl=252 time=0.713 ms
108 bytes from 172.24.20.253: icmp_seq=5 ttl=252 time=0.837 ms
--- 172.24.20.253 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 400ms
rtt min/avg/max/mdev = 0.713/0.812/0.861/0.063 msループ実行する
実行回数を省略するとループ実行されます。
# ping -i 0.1 -s 100 172.24.20.253
PING 172.24.20.253 (172.24.20.253) 100(128) bytes of data.
108 bytes from 172.24.20.253: icmp_seq=1 ttl=252 time=0.767 ms
108 bytes from 172.24.20.253: icmp_seq=2 ttl=252 time=0.742 ms
108 bytes from 172.24.20.253: icmp_seq=3 ttl=252 time=0.644 ms
108 bytes from 172.24.20.253: icmp_seq=4 ttl=252 time=0.739 ms
108 bytes from 172.24.20.253: icmp_seq=5 ttl=252 time=0.769 ms
108 bytes from 172.24.20.253: icmp_seq=6 ttl=252 time=0.819 ms
108 bytes from 172.24.20.253: icmp_seq=7 ttl=252 time=3.39 ms
108 bytes from 172.24.20.253: icmp_seq=8 ttl=252 time=0.814 ms
108 bytes from 172.24.20.253: icmp_seq=9 ttl=252 time=0.776 ms
108 bytes from 172.24.20.253: icmp_seq=10 ttl=252 time=0.711 ms
^C
--- 172.24.20.253 ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 900ms
rtt min/avg/max/mdev = 0.644/1.017/3.393/0.793 msfping 編
fping はデフォルトだとインストールされていません。 epel からインストールします。
インストール
yum でインストールします。
yum -y install epel-release
yum -y install fping回数指定で実行する
-b でサイズ、-c で実行回数、-p で実行間隔を指定します。
# fping -b 100 -c 5 -p 10 172.24.20.253
172.24.20.253 : [0], 128 bytes, 0.87 ms (0.87 avg, 0% loss)
172.24.20.253 : [1], 128 bytes, 0.78 ms (0.82 avg, 0% loss)
172.24.20.253 : [2], 128 bytes, 0.74 ms (0.79 avg, 0% loss)
172.24.20.253 : [3], 128 bytes, 0.81 ms (0.80 avg, 0% loss)
172.24.20.253 : [4], 128 bytes, 0.86 ms (0.81 avg, 0% loss)
172.24.20.253 : xmt/rcv/%loss = 5/5/0%, min/avg/max = 0.74/0.81/0.87ループ実行する
-l を指定するとループ実行されます。
# fping -b 100 -l -p 10 172.24.20.253
172.24.20.253 : [0], 128 bytes, 0.88 ms (0.88 avg, 0% loss)
172.24.20.253 : [1], 128 bytes, 0.82 ms (0.85 avg, 0% loss)
172.24.20.253 : [2], 128 bytes, 0.70 ms (0.80 avg, 0% loss)
172.24.20.253 : [3], 128 bytes, 0.72 ms (0.78 avg, 0% loss)
172.24.20.253 : [4], 128 bytes, 0.78 ms (0.78 avg, 0% loss)
172.24.20.253 : [5], 128 bytes, 0.82 ms (0.78 avg, 0% loss)
172.24.20.253 : [6], 128 bytes, 0.75 ms (0.78 avg, 0% loss)
172.24.20.253 : [7], 128 bytes, 0.79 ms (0.78 avg, 0% loss)
172.24.20.253 : [8], 128 bytes, 0.78 ms (0.78 avg, 0% loss)
172.24.20.253 : [9], 128 bytes, 0.72 ms (0.77 avg, 0% loss)
172.24.20.253 : [10], 128 bytes, 0.71 ms (0.77 avg, 0% loss)
^C
172.24.20.253 : xmt/rcv/%loss = 11/11/0%, min/avg/max = 0.70/0.77/0.88ヘルプ
# fping -h
Usage: fping [options] [targets...]
-a show targets that are alive
-A show targets by address
-b n amount of ping data to send, in bytes (default 56)
-B f set exponential backoff factor to f
-c n count of pings to send to each target (default 1)
-C n same as -c, report results in verbose format
-D print timestamp before each output line
-e show elapsed time on return packets
-f file read list of targets from a file ( - means stdin) (only if no -g specified)
-g generate target list (only if no -f specified)
(specify the start and end IP in the target list, or supply a IP netmask)
(ex. fping -g 192.168.1.0 192.168.1.255 or fping -g 192.168.1.0/24)
-H n Set the IP TTL value (Time To Live hops)
-i n interval between sending ping packets (in millisec) (default 25)
-I if bind to a particular interface
-l loop sending pings forever
-m ping multiple interfaces on target host
-n show targets by name (-d is equivalent)
-O n set the type of service (tos) flag on the ICMP packets
-p n interval between ping packets to one target (in millisec)
(in looping and counting modes, default 1000)
-q quiet (don't show per-target/per-ping results)
-Q n same as -q, but show summary every n seconds
-r n number of retries (default 3)
-s print final stats
-S addr set source address
-t n individual target initial timeout (in millisec) (default 500)
-T n ignored (for compatibility with fping 2.4)
-u show targets that are unreachable
-v show version
targets list of targets to check (if no -f specified)
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