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TCP/IP Network Characteristics 7-23
Displaying the Internet Counters
IP Fragments Dropped: Total number of IP fragments dropped due to either a
lack of memory to store the fragment or received a
duplicate fragment.
IP Error in Header: Total number of IP datagrams received with errors in the
header. These are discarded.
Internet Connections The following counters contain statistics on
connections:
Requested: Number of outgoing Telnet connect attempts made by
users.
Accepted: Number of incoming TCP connections accepted by
Telnet. This count includes those connections accepted
by Telnet then dropped due to no physical port
available.
Established: Number of connections established by TCP. This count
includes those connections accepted by Telnet then
dropped due to no physical port available.
Closed: Number of connections closed by a user or remote host.
Dropped: Number of connections dropped, because of a reset from
the remote host, unsuccessful retransmission, keepalive
timeout, protocol error, or aborted by Telnet due to lack
of available physical ports.
ICMP Messages The following counters contain statistics on ICMP
messages:
Transmitted: Total number of ICMP messages transmitted by the
access server.
Received: Total number of ICMP messages received by the access
server.
Dropped: Total number of ICMP messages dropped by the access
server, because of an error in the ICMP message, such
as incorrect code, checksum error, or incorrect length.
Destination
Unreachable:
Total number of ICMP Destination Unreachable
messages received by the access server. Usually
received when a connect attempt fails because either the
TCP or UDP port is unknown at the remote host, or the
host (or the host’s network) is unreachable.
Field Description