ICMP Destination Unreachable
- ICMP Destination Unreachable
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ICMP Destination Unreachable es un tipo de paquete ICMP cuya función es transportar un mensaje que es generado por un enrutador, y se envía al host de origen, que recibe el mensaje emitido por el enrutador.
El mensaje en sí significa que este router considera inalcanzable el destino al que quiere llegar el host.
Si se recibe de parte del host de destino, significa que el protocolo que se intentó acceder no está activo en aquel momento.
El campo Type tiene el valor 3. El campo código contendrá alguno de los siguientes valores:
- 0 Network unreachable
- 1 Host unreachable
- 2 Protocol unreachable
- 3 Port unreachable
- 4 Fragmentation needed, but do not fragment bit set
- 5 Source route failed
- 6 Destination network unknown
- 7 Destination host unknown
- 8 Source host isolated error (military use only)
- 9 The destination network is administratively prohibited
- 10 The destination host is administratively prohibited
- 11 The network is unreachable for Type Of Service
- 12 The host is unreachable for Type Of Service
- 13 Communication administratively prohibited (administrative filtering prevents packet from being forwarded)
- 14 Host precedence violation (indicates the requested precedence is not permitted for the combination of host or network and port)
- 15 Precedence cutoff in effect (precedence of datagram is below the level set by the network administrators)
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