papers/ globecom2002.pdf
Content
Summary An understanding of the following key points should
have been achieved: - IP is a best-effort delivery
method that uses ICMP messages to alert the sender that the
data did not reach its destination.
- ICMP echo request
and echo reply messages allow the network administrator to test
IP connectivity to aid in the troubleshooting process.
- ICMP messages are transmitted using the IP protocol so
their delivery is unreliable.
- ICMP packets have their
own special header information starting with a type field and a
code field.
- Identify potential causes of specific
ICMP error messages
- The functions of ICMP control
messages
- ICMP redirect/change request messages
- ICMP clock synchronization and transit time estimation
messages
- ICMP information request and reply messages
- ICMP address mask request and reply messages
- ICMP router discovery message
- ICMP router
solicitation message
- ICMP congestion and flow control
messages