linux 服务器禁ping : echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_all
source /proc/sys/net/ipv4/icmp_echo_ignore_all
恢复ping :echo 0 > /proc/sys/net/ipv4/icmp_echo_ignore_all
soucre /proc/sys/net/ipv4/icmp_echo_ignore_all
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