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ICMP stands for Internet Control Message Protocol and is the most used protocol in networking technology. A connectionless protocol, ICMP does not use any port number and works in the network layer. ICMP is commonly used for diagnostic purposes, error reporting or querying any server, and right now attackers are using ICMP to send payloads, which we will discuss here. The popular ping command will use ICMP.
An ICMP ping is an âicmp echo requestâ that is followed up by an âicmp echo replyâ. So you need to specify the appropriate ââicmp-typeâ in your incoming and outgoing chains. Possible values for âicmp-type are listed by âiptables-p icmp-hâ. There are a icmp packets you dont want to recieve or reply to.ero (0) is for echo-reply. Eight (8) is for echo-request. To enable ICMP ping incoming client request use following iptables rule (you need to add following rules to script). My default firewall policy is blocking everything.