#关闭 echo “1” >/proc/sys/net/ipv4/icmp_echo_ignore_all #打开 echo “0” >/proc/sys/net/ipv4/icmp_echo_ignore_all
#关闭 echo “1” >/proc/sys/net/ipv4/icmp_echo_ignore_all #打开 echo “0” >/proc/sys/net/ipv4/icmp_echo_ignore_all
原文：https://www.cnblogs.com/linuxde/p/8719357.html