ITrace is a mechanism for using ICMP packets to traceback IP attacks.
The IP data part of ICMP packets contains the ICMP protocol. To help the end system identify the problematic packet, ICMP messages additionally include the whole IP header from the original message. The IP protocol number 1 is assigned to the ICMP header, which follows the IPv4 or IPv6 packet header. In contrast to IP, ICMP is not connected to a transport layer protocol like TCP or UDP. Because of this, ICMP is a connectionless protocol, meaning that devices can transmit messages to one another without first establishing a connection. When troubleshooting or debugging the internet, the ICMP Query message is utilized. It is typical to ping a message with this one. An echo-request message may be sent by either a router or a host.
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