What are the various types of ICMP messages?

What are the various types of ICMP messages?

1 Answer

• Internet Control Message Protocol (ICMP) messages:
• Different types of ICMP messages:
• Source quench message:
• Echo reply message:
• TTL (Time to live) expired message:
• Port unreachable message:

How many categories are there in ICMP messages?

So far you learned about 2 types of messages sent by ICMP.

What is ICMP explain different type of message handled by ICMP?

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).

Which two types of ICMP messages are common to both ICMPv4 and ICMPv6?

The ICMP messages common to both ICMPv4 and ICMPv6 include: host confirmation, destination (net, host, protocol, port) or service unreachable, time exceeded, and route redirection.

Which ICMP types 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.

What are the most commonly employed ICMP message types?

Commonly used ICMP types are echo request and echo reply (used for ping) and time to live exceeded in transit (used for traceroute).

What is ICMP protocol What are different type of message and error-reporting?

ICMP messages are divided into error-reporting messages and query messages. The error-reporting messages report problems that a router or a host (destination) may encounter. The query messages get specific information from a router or another host.

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.

What is an ICMP response?

ICMP is part of the Internet protocol suite as defined in RFC 792. ICMP messages are typically used for diagnostic or control purposes or generated in response to errors in IP operations (as specified in RFC 1122).

What is ICMP traffic?

ICMP traffic is necessary for troubleshooting TCP/IP and for managing its flow and proper function. However, ICMP is also dangerous. Hackers can use it to map and attack networks, so it needs to be restricted. Like TCP and UDP, ICMP is a protocol within TCP/IP that runs over IP.