October 2002
Intermediate to advanced
344 pages
10h 17m
English
Content preview from The ABCs of TCP/IP, 2nd Edition
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The Internet Protocol and Related Protocols 93
Protocol Unreachable
If IP is carrying a higher layer protocol, such as TCP, it is possible that the
destination host is not configured to support that transport layer protocol. In
this situation, either the distant router or the destination host will return a
Type 3, Code 2 Protocol Unreachable ICMP message.
Port Unreachable
If one transmits an application, it uses a defined port number. If the destination
device is not configured to support the application, it does not service the
port conveyed in the transport header. Instead, the destination host or router
connected to the distant network will respond with a Type 3, Code 3 Port
Unreachable ICMP message.
Fragmentation Needed and Don’t Fragment Was Set
If the ...
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