Monday, 16 July 2012

Disable PING (ICMP) Response On Linux System

Disable PING (ICMP) Response On Linux System

You can setup kernel variable to drop all ping packets. Type the following command at shell prompt:

[root@siddhesh ~]#echo "1" > /proc/sys/net/ipv4/icmp_echo_ignore_all

This instructs the kernel to simply ignore all ping requests (ICMP type 0 messages).

[root@siddhesh ~]#echo "0" > /proc/sys/net/ipv4/icmp_echo_ignore_all

This instructs the kernel to allow all ping requests from remote.

You can add following line to /etc/sysctl.conf file to make this changes permanently.

[root@siddhesh ~]#vi /etc/sysctl.conf
net.ipv4.icmp_echo_ignore_all = 1

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