2018-03-13 Linux 宅必备 ## 临时改变 禁用icmp ``` echo 1 >/proc/sys/net/ipv4/icmp_echo_ignore_all ``` 启用icmp ``` echo 0 >/proc/sys/net/ipv4/icmp_echo_ignore_all ``` ## 永久禁用icmp ``` vim /etc/sysctl.conf net.ipv4.conf.icmp_echo_ignore_all = 1 ```