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The ICMP header starts after the IPv4 header and is identified by its protocol number, 1. [6] All ICMP packets have an eight-byte header and variable-sized data section. The first four bytes of the header have fixed format, while the last four bytes depend on the type and code of the ICMP packet.
ICMP Internet Control Message Protocol: RFC 792: 0x02 2 IGMP Internet Group Management Protocol: RFC 1112: 0x03 3 GGP Gateway-to-Gateway Protocol: RFC 823: 0x04 4 IP-in-IP IP in IP (encapsulation) RFC 2003: 0x05 5 ST Internet Stream Protocol: RFC 1190, RFC 1819: 0x06 6 TCP Transmission Control Protocol: RFC 793: 0x07 7 CBT Core-based trees: RFC ...
Code: 8 bits The Code field value depends on the message type and provides an additional level of message granularity. Checksum: 16 bits Provides a minimal level of integrity verification for the ICMP message. The checksum is calculated from the ICMP message (starting with the Type field), prepended with an IPv6 pseudo-header. [1] See below.
Internet Control Message Protocol: RFC 792 Internet Group Management Protocol: RFC 966 (v 0), RFC 988 (v 0), RFC 1054 (v 1), 1112 (v 1), RFC 2236 (v 2), RFC 3376 (v 3) Internet Key Exchange: IKE RFC 2409, RFC 2407 (ISAKMP), RFC 2408 (ISAKMP), IKEv2 RFC 4306, IKEv2 RFC 4301, RFC 4310 (DNS) Internet Message Access Protocol
EtherType is a two-octet field in an Ethernet frame.It is used to indicate which protocol is encapsulated in the payload of the frame and is used at the receiving end by the data link layer to determine how the payload is processed.
Ping operates by means of Internet Control Message Protocol (ICMP) packets. Pinging involves sending an ICMP echo request to the target host and waiting for an ICMP echo reply. The program reports errors, packet loss , and a statistical summary of the results, typically including the minimum, maximum, the mean round-trip times, and standard ...
The port numbers in the range from 0 to 1023 (0 to 2 10 − 1) are the well-known ports or system ports. [3] They are used by system processes that provide widely used types of network services.
Then, any device along the path whose MTU is smaller than the packet will drop it, and send back an Internet Control Message Protocol (ICMP) Fragmentation Needed (Type 3, Code 4) message containing its MTU, allowing the source host to reduce its path MTU appropriately. The process is repeated until the MTU is small enough to traverse the entire ...