TCP/IP Network Administration- P16

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[Appendix F] F.2 TCP Segment Header

F.1 IP Datagram Header

Book Index

F.3 ICMP Parameter Problem Message Header

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[Appendix F] F.3 ICMP Parameter Problem Message Header

Appendix F Selected TCP/IP Headers

Previous: F.2 TCP Segment Header

F.3 ICMP Parameter Problem Message Header

This description is taken from pages 8 and 9 of RFC 792, Internet Control Message Protocol, by Jon Postel, Information Sciences Institute, University of Southern California.

Parameter Problem Message

0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Code | Checksum | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Pointer | unused | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Internet Header + 64 bits of Original Data Datagram | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Type

Code

0 = pointer indicates the error.

Checksum

The checksum is the 16-bit ones's complement of the one's complement sum of the ICMP message starting with the ICMP Type. For computing the checksum , the checksum field should be zero.

Pointer

If code = 0, identifies the octet where an error was detected.

Internet Header + 64 bits of Data Datagram

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The internet header plus the first 64 bits of the datagram that elicited this error response.

[Appendix F] F.3 ICMP Parameter Problem Message Header

TCP/IP Network Administration

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Previous: F.2 TCP Segment Header F.2 TCP Segment Header Book Index