- Routing error:
- Routing error can
occur when:
- Some intermediate node or
link has
failed
- A top-level router
(a router in the
Internet backbone)
of the Internet
do not recognize
the destination network ID
- (At the time that the routing tables were computed, the destination network was not operational)
Internet backbone: click here
- Some intermediate node or
link has
failed
- Routing error can
occur when:
- Reporting
a
routing error:
- Use the ICMP
Destination unreachable
packet
- Packet format:
- The type code is equal to 3
- The ICMP data contains the first 8 bytes of the IP packet (for error reference)
Graphically:
- Use the ICMP
Destination unreachable
packet