TAILIEUCHUNG - Lecture TCP-IP protocol suite - Chapter 9: Internet Control Message Protocol (ICMP)

After studying this chapter you will be able to: Be familiar with the ICMP message format, know the types of error reporting messages, know the types of query messages, be able to calculate the ICMP checksum, know how to use the ping and traceroute commands, understand the modules and interactions of an ICMP package. | Chapter 9 Internet Control Message Protocol (ICMP) CONTENTS TYPES OF MESSAGES MESSAGE FORMAT ERROR REPORTING QUERY CHECKSUM ICMP PACKAGE Figure 9-1 Position of ICMP in the network layer Figure 9-2 Encapsulation of ICMP packet TYPES OF MESSAGES Figure 9-3 ICMP messages MESSAGE FORMAT Figure 9-4 General format of ICMP messages ERROR REPORTING ICMP always reports error messages to the original source. Figure 9-5 Error-reporting messages Important points about ICMP error messages: 1. No ICMP error message for a datagram carrying an ICMP error message. 2. No ICMP error message for a fragmented datagram that is not the first fragment. 3. No ICMP error message for a datagram having a multicast address. 4. No ICMP error message for a datagram with a special address such as or . Figure 9-6 Contents of data field for error messages Figure 9-7 Destination-unreachable format Destination-unreachable messages with codes 2 or 3 can be created only by the .

• Quản trị mạng
• TCP IP protocol suite
• Lecture TCP IP protocol suite
• Network layer
• Internet protocol
• Internet control message protocol
• ICMP messages
• Internet control message protocol