Chap-09 ICMP - Chapter9 Internet Control Message Internet...

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TCP/IP Protocol Suite 1 Chapter   9 Chapter   9 Upon completion you will be able to: Internet Control Message Internet Control Message Protocol Protocol 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 Objectives
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TCP/IP Protocol Suite 2 Figure 9.1 Position of ICMP in the network layer
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TCP/IP Protocol Suite 3 Figure 9.2 ICMP encapsulation
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TCP/IP Protocol Suite 4 9.1 TYPES OF MESSAGES ICMP messages are divided into error-reporting messages and query ICMP messages are divided into error-reporting messages and query messages. The error-reporting messages report problems that a router or messages. The error-reporting messages report problems that a router or a host (destination) may encounter. The query messages get specific a host (destination) may encounter. The query messages get specific information from a router or another host. information from a router or another host.
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TCP/IP Protocol Suite 5 Figure 9.3 ICMP messages
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TCP/IP Protocol Suite 6 Table 9.1 Table 9.1 ICMP messages ICMP messages
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TCP/IP Protocol Suite 7 9.2 MESSAGE FORMAT An ICMP message has an 8-byte header and a variable-size data section. An ICMP message has an 8-byte header and a variable-size data section. Although the general format of the header is different for each Although the general format of the header is different for each message type, the first 4 bytes are common to all. message type, the first 4 bytes are common to all.
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TCP/IP Protocol Suite 8 Figure 9.4 General format of ICMP messages
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TCP/IP Protocol Suite 9 9.3 ERROR REPORTING IP, as an unreliable protocol, is not concerned with error checking and IP, as an unreliable protocol, is not concerned with error checking and error control. ICMP was designed, in part, to compensate for this error control. ICMP was designed, in part, to compensate for this shortcoming. ICMP does not correct errors, it simply reports them. shortcoming. ICMP does not correct errors, it simply reports them. The topics discussed in this section include: The topics discussed in this section include: Destination Unreachable Destination Unreachable Source Quench Source Quench Time Exceeded Time Exceeded Parameter Problem Parameter Problem Redirection Redirection
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TCP/IP Protocol Suite 10 ICMP always reports error messages to the original source. Note: Note:
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TCP/IP Protocol Suite 11 Figure 9.5 Error-reporting messages
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TCP/IP Protocol Suite 12 The following are important points about ICMP error messages: No ICMP error message will be generated in response to a datagram carrying an ICMP error message. No ICMP error message will be generated for a
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Chap-09 ICMP - Chapter9 Internet Control Message Internet...

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