What is ICMP format?

ICMP Message Format AN ICMP message includes an 8-byte header and a variable size data format. Type: It is an 8-bit field. It represents the ICMP message type. The values area from 0 to 127 are described for ICMPv6, and the values from 128 to 255 are the data messages.

What are the message types used by ICMP?

Internet Control Message Protocol (ICMP) Parameters

  • Type 0 — Echo Reply.
  • Type 1 — Unassigned.
  • Type 2 — Unassigned.
  • Type 3 — Destination Unreachable.
  • Type 4 — Source Quench (Deprecated)
  • Type 5 — Redirect.
  • Type 6 — Alternate Host Address (Deprecated)
  • Type 7 — Unassigned.

What are 5 types of errors handled by ICMP messages?

ICMP uses the source IP address to send the error message to the source (originator) of the datagram. Five types of errors are handled: destination unreachable, source quench, time exceeded, parameter problems, and redirection (see figure1).

What is query message in ICMP?

ICMP Query Messages The ICMP Query message is used for error handling or debugging the internet. This message is commonly used to ping a message. Echo-request and echo-reply message. A router or a host can send an echo-request message. It is used to ping a message to another host that “Are you alive”.

Is ping An ICMP message?

ICMP is probably most well known as the message protocol used for the ping command. A ping command sends an ICMP echo request to the target host. The target host responds with an echo reply.

How many ICMP error types or message types are possible?

ICMP defines 16 possible codes for IPv4 for this error message. From these, three are obsolete or inappropriate for normal usages. The following table lists all codes for the IPv4 destination unreachable error message.

What is ICMPv4 packet format?

ICMPv4 protocol is a network layer protocol. This protocol is an error reporting protocol. And it reports an error that occurs while IP datagram travels from the source host to the destination host. ICMPv4 is a message-oriented protocol that is used in assistance with IP protocol as IP protocol lack error reporting.

What is query message?

Query messages are requests from Google for pricing or metadata updates. They are used with both the Pull and Changed Pricing delivery modes. The root element of Query messages is .

How do I send an ICMP echo request?

To send an ICMP echo request packet to the IP address that you specify: Issue the ping command in Privileged Exec mode….The following characters can appear in the display after issuing the ping command:

  1. !
  2. .
  3. ?
  4. A—Address mask request message.
  5. a—Address mask reply message.
  6. D—Router discovery advertisement message.

What is ping syntax?

ping -aAbBdDfhLnOqrRUvV6 -c count -F flowlabel -i interval -I interface -l preload -m mark -M pmtudisc_option -N nodeinfo_option -w deadline -W timeout -p pattern -Q tos -s packetsize -S sndbuf -t ttl -T timestamp option hop destinationping / Syntax

What are ICMP error reporting messages?

The error-reporting message defines that the router encounters a problem when it processes an IP packet, then it reports a message. Error messages are continually transmitted to the original source because the only data possible in the datagram around the route is the source and destination IP addresses.

What is ICMPv4 explain general format of ICMPv4 messages?

ICMPv4 is a message-oriented protocol that is used in assistance with IP protocol as IP protocol lack error reporting. Ip datagram encapsulates ICMPv4 message before passing it to datalink layer. It is only responsible for reporting the error. ICMPv4 protocol doesn’t correct the error.