[Appendix F] F.2 TCP Segment Header F.1 IP Datagram Header Book Index F.3 ICMP Parameter Problem Message Header [ Library Home | DNS & BIND | TCP/IP | sendmail | sendmail Reference | Firewalls | Practical Security ] file:///C|/mynapster/Downloads/warez/tcpip/appf_02.htm (3 of 3) [2001-10-15 09:19:36] Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. [Appendix F] F.3 ICMP Parameter Problem Message Header Previous: F.2 TCP Segment Header Appendix F Selected TCP/IP Headers 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 12 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 The internet header plus the first 64 bits of the datagram that elicited this error response. file:///C|/mynapster/Downloads/warez/tcpip/appf_03.htm (1 of 2) [2001-10-15 09:19:36] Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. [Appendix F] F.3 ICMP Parameter Problem Message Header Previous: F.2 TCP Segment Header TCP/IP Network Administration F.2 TCP Segment Header Book Index [ Library Home | DNS & BIND | TCP/IP | sendmail | sendmail Reference | Firewalls | Practical Security ] file:///C|/mynapster/Downloads/warez/tcpip/appf_03.htm (2 of 2) [2001-10-15 09:19:36] Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. . Previous: F.2 TCP Segment Header TCP/IP Network Administration F.2 TCP Segment Header Book Index [ Library Home | DNS & BIND | TCP/IP | sendmail | sendmail. Problem Message Header Previous: F.2 TCP Segment Header Appendix F Selected TCP/IP Headers F.3 ICMP Parameter Problem Message Header This description is