ICMP (Internet Control Message Protocol)
ICMP (Internet Control Message Protocol) is an error-reporting protocol network device, such as the router used to generate error messages on the source IP address when network problems prevent delivery of IP packets. The ICMP source creates and sends the IP address to the address that indicates that the Internet for packets can not reach the router, service or host. The ability to send, receive, or process ICMP messages in any IP network device.
While ICMP is not used regularly in end-user applications, it is used by Network Administrators to troubleshoot Internet connection in diagnostic utilities, including ping and traceroute.
One of the main protocols of the Internet Protocol Suite, ICMP is used by router, intermediary devices or hosts, which hosts other router, intermediary devices, or hosts to provide error information or updates. Widely used IPv4 (Internet Protocol version 4) and new IPv6 versions of the ICMP protocol (ICMPv4 and ICMPv6), respectively.
ICMP messages are sent as datagrams and have an IP header encapsulating ICMP data. The ICMP packet IP data section contains IP packets with ICMP. ICMP messages also have full IP headers from the original message, so the last system knows which packet failed.
The ICMP header appears after the IPv4 or IPv6 packet header and is identified as IP protocol number one. The complex protocol consists of three fields:
- The main type that identifies the ICMP message;
- The modest code that contains more information about the type field; And
- Checksum helps in detecting the errors introduced during transmission.
ICMP is used to deny service by sending IP packets larger than the number of bytes allowed by the IP protocol.
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