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What is an ICMPv6 packet?

What is an ICMPv6 packet?

ICMPv6 (ICMP for IPv6) ICMPv6 is used by IPv6 nodes to report errors encountered in processing packets, and to perform other internet-layer functions, such as diagnostics (ICMPv6 “ping”).

What is the ICMPv6 echo message type?

Type: Identifies the ICMPv6 message type; for Echo Request messages the value is 128, and for Echo Reply messages 129. (Recall that in ICMPv6, informational messages always have a Type value of 128 or higher.) If this is sent in the Echo Request it is copied into the Echo Reply to be sent back to the source.

What is the difference between ICMP and ICMPv6?

The term ICMP refers to ICMP in general, and the terms ICMPv4 and ICMPv6 to refer specifically to the versions of ICMP used with IPv4 and IPv6, respectively. ICMPv6 plays a far more important role in the operation of IPv6 than ICMPv4 does for IPv4.

Which protocol number represents ICMPv6?

ICMPv6, Internet Control Message Protocol for IPv6. IP Protocol: 58.

What is the purpose of ICMPv6?

The Internet Control Message Protocol (ICMP) is a network layer protocol used by network devices to diagnose network communication issues. ICMP is mainly used to determine whether or not data is reaching its intended destination in a timely manner.

How large is a basic IPv6 header?

40 bytes
The size of the IPv6 header has doubled from 20 bytes for a minimum-sized IPv4 header to 40 bytes. However, the new IPv6 header contains source and destination addresses that are four times longer than IPv4 source and destination addresses.

Is ICMP an IP protocol?

ICMP is actually a user of the IP protocol–in other words, ICMP messages must be encapsulated within IP packets. However, ICMP is implemented as part of the IP layer. So ICMP processing can be viewed as occurring parallel to, or as part of, IP processing.

What is ICMP port number?

ICMP has no ports and is neither TCP nor UDP. ICMP is IP protocol 1 (see RFC792), TCP is IP protocol 6 (described in RFC793) and UDP is IP protocol 17(see RFC768).

What protocol is TCP?

What is TCP? TCP stands for Transmission Control Protocol a communications standard that enables application programs and computing devices to exchange messages over a network. It is designed to send packets across the internet and ensure the successful delivery of data and messages over networks.

What protocol number is TCP?

Assigned Internet Protocol Numbers

Decimal Keyword Protocol
5 ST Stream
6 TCP Transmission Control
8 EGP Exterior Gateway Protocol


Unlike the Internet Protocol (IP), ICMP is not associated with a transport layer protocol such as TCP or UDP. This makes ICMP a connectionless protocol: one device does not need to open a connection with another device before sending an ICMP message.