Step2 : Save this changes to IPtables file (/etc/sysconfig/iptables), restart the IPtables service and check your IPtables status whether your IPtables chain is updated or not.
#service iptables save
#service iptables restart
How to allow icmp ping request in case you want them,First we have to remove the rule which we created for blocking the icmp ping.#iptables –D INPUT –p icmp –icmp-type echo-request –j DROP
Then execute the following commands#iptables –A INPUT –p icmp –icmp-type echo-request –j ACCEPT#service iptables save#service iptables restart
Some points to be noted
What are the methods used by hackers using this ICMP ping?
Though these are old denial-of-service attack (DoS attack), worth to learn them
Ping to death
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