Internet
Control Message Protocol (ICMP)
Describe the meaning of the Time exceeded?
Describe the meaning of the
Destination Unreachable?
•This
message is used when the router cannot
locate the destination since it was down, or the destination address is invalid.
locate the destination since it was down, or the destination address is invalid.
•It
can
also occur if an IP packet with the don’t fragment bit set
,cannot be delivered.
Describe the meaning of the Time exceeded?
•This
message is sent when an IP datagram with the TTL field equal to zero is obtained at a
router.
•This event
is a symptom
that packets
are looping (due to mistakes in the routing table), that there
is large congestion,
or that the TTL values are being set too low.
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