临时生效的办法
关闭回应:
[root@host ~]# echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_all
// 客户端测试
➜ ~ ping 00.00.000.000
PING 00.00.000.000 (00.00.000.000): 56 data bytes
Request timeout for icmp_seq 0
Request timeout for icmp_seq 1
Request timeout for icmp_seq 2
Request timeout for icmp_seq 3
Request timeout for icmp_seq 4
Request timeout for icmp_seq 5
Request timeout for icmp_seq 6
开启回应:
[root@host ~]# echo 0 > /proc/sys/net/ipv4/icmp_echo_ignore_all
// 客户端测试
➜ ~ ping 00.00.000.000
PING 00.00.000.000 (00.00.000.000): 56 data bytes
64 bytes from 00.00.000.000: icmp_seq=0 ttl=49 time=354.208 ms
64 bytes from 00.00.000.000: icmp_seq=1 ttl=49 time=377.074 ms
永久生效
// 重启生效(init 6 or reboot) or 指令生效(sysctl -p)
/etc/sysctl.conf(linux 内核参数) -> net.ipv4.icmp_echo_ignore_all=1