Allow and forbid ping in Linux
一、临时生效
1、允许ping
echo 0 >/proc/sys/net/ipv4/icmp_echo_ignore_all
2、禁止ping
echo 1 >/proc/sys/net/ipv4/icmp_echo_ignore_all
二、永久生效
修改文件：/etc/sysctl.conf
1、允许ping
增加一行：
net.ipv4.icmp_echo_ignore_all=0
2、禁止ping
增加一行：
net.ipv4.icmp_echo_ignore_all=1
修改后使用以下命令使之生效：
sysctl -p
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