June 2004
Intermediate to advanced
840 pages
39h 47m
English
Content preview from The Internet and Its Protocols
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2.6 Internet Control Message Protocol (ICMP) 69
Table 2.17 ICMP Destination Unreachable Messages Carry Message Codes to Indicate the Reason for the
Delivery Failure
Message
Code Meaning
11
12
13
Network Unreachable. This error is returned by a router that cannot forward an IP packet
because it doesn't have an entry in its routing table for any subnet that contains the destination
address. This error is advisory and does not immediately require that the source node take any
action.
Host Unreachable. This error is slightly different from the previous error. It is intended to be
returned by what should be the final hop router ...
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