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How to disable ICMP ping request on your linux server?
Ping command is basically working on sending an Internet Control Message Protocol (ICMP) echo request packets to the target host and waiting for an ICMP response. To enable the PING refer to the following URL and make sure that you have logged in as a root user.
echo “0″ >> /proc/sys/net/ipv4/icmp_echo_ignore_all
In order to stop ICMP attack, most of the server is disabled the PING command to secure the server, refer to the following command to disable the PING command.
echo “1″ >> /proc/sys/net/ipv4/icmp_echo_ignore_all
You can disable ping request trough sysctl.conf
: net.ipv4.icmp_echo_ignore_all = 1
Then run “sysctl -p”
To disable incoming and outgoing ping request on your CSF firewall, please try the following values in your csf.conf file.
ICMP_IN = "0" ICMP_IN_RATE = "0" ICMP_OUT = "1" ICMP_OUT_RATE = "0"
iptables -A OUTPUT -p icmp --icmp-type echo-request -j DROP or iptables -A OUTPUT -p icmp --icmp-type 8 -j DROP
To disable incoming ping request on iptables, please use the following command.
iptables –A INPUT –p icmp –icmp-type echo-request –j DROP
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