ICMP Destination Unreachable
De Wikipedia, la enciclopedia libre
El ICMP Destination Unreachable es un mensaje ICMP que es generado por un host, este recibe el mensaje de un enrutador intermedio que significa que este router considera el destino, inalcanzable.
Si se recibe de parte del host de destino, significa que el protocolo que se intentó accesar no está activo en aquel momento.
El campo Type tiene el valor 3. El campo código contendra 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 Destintation 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)
