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Table Of Contents  The TCP/IP Guide
 9  TCP/IP Lower-Layer (Interface, Internet and Transport) Protocols (OSI Layers 2, 3 and 4)
      9  TCP/IP Internet Layer (OSI Network Layer) Protocols
           9  Internet Control Message Protocol (ICMP/ICMPv4 and ICMPv6)
                9  ICMP Message Types and Formats
                     9  ICMP Version 4 (ICMPv4) Error Message Types and Formats

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ICMPv4 Source Quench Messages
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ICMPv4 Time Exceeded Messages
(Page 2 of 3)

ICMPv4 Time Exceeded Message Format

Table 91 and Figure 142 show the specific format for ICMPv4 Time Exceeded messages.


Figure 142: ICMPv4 Time Exceeded Message Format

 



Table 91: ICMPv4 Time Exceeded Message Format

Field Name

Size (bytes)

Description

Type

1

Type: Identifies the ICMP message type; for Time Exceeded messages this is set to 11.

Code

1

Code: Identifies the “subtype” of error being communicated. A value of 0 indicates expiration of the IP Time To Live field; a value of 1 indicates that the fragment reassembly time has been exceeded.

Checksum

2

Checksum: 16-bit checksum field for the ICMP header, as described in the topic on the ICMP common message format.

Unused

4

Unused: 4 bytes that are left blank and not used.

Original Datagram Portion

Variable

Original Datagram Portion: The full IP header and the first 8 bytes of the payload of the datagram that was dropped due to expiration of the TTL field or reassembly timer.


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