CentOS prohibit and open ping settings

Prohibit Ping:

The code is as follows	Copy Code
Echo 1 >/proc/sys/net/ipv4/icmp_echo_ignore_all

Allow Ping:

The code is as follows	Copy Code
echo 0 >/proc/sys/net/ipv4/icmp_echo_ignore_all

Firewall/etc/sysconfig/iptables Add

-A input-p icmp-m ICMP--icmp-type echo-request-m State--state New-j

/etc/init.d/iptables restart

Iptables-l-nv
    7   588 accept     ICMP--  *  & nbsp;   *       0.0.0.0/0             0.0.0.0/0          State NEW ICMP type 8