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How many types of ICMP are there?
Many of the types of ICMP message are now obsolete and are no longer seen in the Internet. Some important ones which are widely used include: Echo Reply (0), Echo Request (8), Redirect (5), Destination Unreachable (3), Traceroute (30), Time Exceeded (11). Many of these ICMP types have a “code” field.
What is ICMP command?
Internet Control Message Protocol (ICMP) is one of the protocols of the TCP/IP suite. The ICMP echo request and the ICMP echo reply messages are commonly known as ping messages. The ping command sends an ICMP echo request to a device on the network, and the device immediately responds with an ICMP echo reply.
How do I send ICMP traffic?
You can send an Internet Control Message Protocol (ICMP) or ICMPv6 echo request packet to a specific IP address using the ping command. The following characters can appear in the display after issuing the ping command: !
What is difference between ICMP and IGMP?
ICMP and IGMP are both protocols that operate within the sphere of IP; they are part of IP. ICMP is used for control messages (hence the name, “Internet Control Message Protocol”), while IGMP is used to facilitate management of multicast groups between cooperating routers and switches.
Is ICMP a transport layer protocol?
ICMP can “never” be considered a Network Layer protocol. If it were to be considered so, then, it will have to rely on another transport layer protocol to carry its data i.e. Its data will become the payload for a transport layer protocol, as in the case of IP. ICMP is a Transport layer protocol just like TCP and UDP.
Is ICMP a TCP or UDP?
ICMP is a network layer protocol. There is no TCP or UDP port number associated with ICMP packets as these numbers are associated with the transport layer above.
What does ICMP mean?
Short for Internet Control Message Protocol, ICMP is an extension to the Internet Protocol defined by RFC 792 and an error reporting protocol for TCP/IP messages. Most users are familiar with ICMP from using the ping command. Note.