系统中有个最最常用命令工具--ping,而fping 是ping 工具的加强版本。安装过程很简单：
[root@mail /]# wget --limit-rate 500k http://www.fping.org/dist/fping-3.8.tar.gz
[root@mail /]# tar zxvf fping-3.8.tar.gz && cd fping-3.8
[root@mail /]# ./configure && make && make install
[root@mail /]# fping --help
fping: invalid option -- '-'
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)
-l loop sending pings forever
-m ping multiple interfaces on target host
-n show targets by name (-d is equivalent)
-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
-I if bind to a particular interface
-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
-O n set the type of service (tos) flag on the ICMP packets
-v show version
实用案例
- 例出局域网中存活的主机
[root@mail /]# fping -a 192.168.0.1/24 -g 2> /dev/null
192.168.0.1
192.168.0.3
………………
- 查询DNS
fping 有一个-d ,它通过每一个echo 回应进行DNS查询来返回主机名。使用该选项可以在ping 的回应信息中打印出主机名而非IP地址
[root@mail /]# cat ip_list.txt
192.168.20.5
192.168.20.11
192.168.20.53
192.168.20.241
……………………
[root@mail /]# fping -a -d 2>/dev/null < ip_list.txt
www.vqiu
dns.vqiu