Viewing ICMP Group Statistics
9-2
Figure9- 1. ICM P Group Window
The ICMP Group window displays the following message statistics:
ICMP Received Message Statistics
Total Messages
The total number of ICMP messages which the entity received, according to the
icmpInMsgs. This counter includes all those counted by icmpInErrors.
Errors
The number of ICMP messages which the entity received but determined as
having ICMP-specific errors (bad ICMP checksums, bad length, etc.), according to
the icmpInErrors.
Destination Unreachable
The number of ICMP Destination Unreachable messages received, according to
the icmpInDestUnreachs. A gateway issues a destination unreachable message
when it cannot deliver a datagram due to one of the following causes:
• network, host, protocol, or port was unreachable
• fragmentation was necessary but disallowed by the “don’t fragment” bit
• source route failed
• destination network or host unknown
• source host isolated
• communication with destination network or host administratively prohibited
• network or host unreachable for type of service