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G.3. ICMP Parameter Problem Message Header

This description is taken from pages 8 and 9 of RFC 792, Internet Control Message Protocol.

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.


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