icmp types

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 the two types of ICMP message?
What are 5 types of errors handled by ICMP messages?
How many ICMP types are there?
What is ICMP code and type?
What is Ping ICMP type?
Where is ICMP used?
What ICMP error message is sent if an ICMP message is lost?
What is the main function of ICMP?
What is ICMP in networking?
What OSI layer is ICMP?
What does ICMP type 3 code 13 mean?
What ICMP types should I allow?

What are the two types of ICMP message?

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. A router or a host can send an echo-request message. ... An echo-reply message is sent by the router or the host that receives an echo-request message.

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).

How many ICMP types are there?

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 code and type?

ICMP (Internet Control Message Protocol) is a network protocol used for diagnostics and network management. ... For example, type 8 is used for an ICMP request and type 0 is used for an ICMP reply. We use type 3 for destination unreachable messages. The second byte called code specifies what kind of ICMP message it is.

What is Ping ICMP type?

Ping is a computer network administration software utility used to test the reachability of a host on an Internet Protocol (IP) network. ... Ping operates by sending Internet Control Message Protocol (ICMP) echo request packets to the target host and waiting for an ICMP echo reply.

Where is ICMP used?

ICMP is mainly used to determine whether or not data is reaching its intended destination in a timely manner. Commonly, the ICMP protocol is used on network devices, such as routers. ICMP is crucial for error reporting and testing, but it can also be used in distributed denial-of-service (DDoS) attacks.

What ICMP error message is sent if an ICMP message is lost?

Time exceeded message :

When some fragments are lost in a network then the holding fragment by the router will be droped then ICMP will take source IP from discarded packet and informs to the source, of discarded datagram due to time to live field reaches to zero, by sending time exceeded message.

What is the main function of ICMP?

ICMP is a transport level protocol within TCP/IP which communicates information about network connectivity issues back to the source of the compromised transmission. It sends control messages such as destination network unreachable, source route failed, and source quench.

What is ICMP in networking?

The Internet Control Message Protocol (ICMP) is a protocol that devices within a network use to communicate problems with data transmission.

What OSI layer is ICMP?

ICMP (Internet Control Message Protocol) is located at the Network layer of the OSI model (or just above it in the Internet layer, as some argue), and is an integral part of the Internet Protocol suite ( commonly referred to as TCP/IP). ICMP is assigned Protocol Number 1 in the IP suite according to IANA.org.

What does ICMP type 3 code 13 mean?

Explanation: Type 3 code 13 is destination unreachable administratively prohibited. This type of message is typically returned from a device blocking a port. Click to see full answer. In this regard, what does ICMP type 3 code 13 mean? An ICMP type 3, code 13 response means that the machine is down.

What ICMP types should I allow?

The only essential ICMP traffic you need to allow in and out of your firewall is Type 3 and Type 4. Everything else is either optional or should be blocked. Notes: To send ping requests, allow type 8 OUT and type 0 IN.