display tcp statistics

Function

The display tcp statistics command displays the statistics about TCP packets.

Format

display tcp statistics

Parameters

None

Views

All views

Default Level

1: Monitoring level

Usage Guidelines

You can run the display tcp statistics command to view the statistics about TCP packets in the current system. The statistics information includes the number of received and sent TCP packets, including the number of repeated packets and the number of packets with checksum errors. In addition, the statistics information includes the number of established connections, the number of retransmitted packets, and the number of Keepalive packets. Most of the preceding statistics items are expressed in packets and some of them are expressed in bytes.

Example

# View the statistics about TCP packets.

<sysname> display tcp statistics

Received packets:
     Total: 0
     Total(64bit high-capacity counter): 0
     packets in sequence: 0 (0 bytes)
     window probe packets: 0, window update packets: 0
     checksum error: 0, offset error: 0, short error: 0

     duplicate packets: 0 (0 bytes), partially duplicate packets: 0 (0 bytes)
     out-of-order packets: 0 (0 bytes)
     packets of data after window: 0 (0 bytes)
     packets received after close: 0

     ACK packets: 0 (0 bytes)
     duplicate ACK packets: 0, too much ACK packets: 0

Sent packets:
    Total: 0
     Total(64bit high-capacity counter): 0
     urgent packets: 0
     control packets: 0 (including 0 RST)
     window probe packets: 0, window update packets: 0

     data packets: 0 (0 bytes),    data packets retransmitted: 0 (0 bytes)
     ACK-only packets: 0 (0 delayed)

Other information:
    Retransmitted timeout: 0, connections dropped in retransmitted timeout: 0
    Keep alive timeout: 0, keep alive probe: 0,     Keep alive timeout, so connections disconnected : 0
    Initiated connections: 0,     accepted connections: 0, established connections: 0
    Closed connections: 0 (    dropped: 0, initiated dropped: 0)
    Packets dropped with MD5 authentication: 0
    Packets permitted with MD5 authentication: 0
    Send Packets permitted with Keychain authentication: 0
    Receive Packets permitted with Keychain authentication: 0
    Receive Packets Dropped with Keychain authentication: 0

**Table 1** Description of the **display tcp statistics** command output
Item	Description
Received packets	Indicates the number of received packets.
Total	Indicates the total number of packets.
Total (64bit high-capacity counter)	Indicates the total number of packets (which is counted by a 64-bit statistical counter).
packets in sequence (bytes)	Indicates the number of packets that are received in a certain sequence, in bytes.
window probe packets	Indicates the number of window probe packets.
window update packets	Indicates the number of window update packets.
checksum error	Indicates the number of packets with checksum errors.
offset error	Indicates the number of packets whose length is incorrect.
short error	Indicates the number of packets whose length is too short.
duplicate packets( bytes)	Indicates the number of duplicated packets, in bytes.
partially duplicate packets( bytes)	Indicates the number of partially duplicated packets, in bytes.
out-of-order packets( bytes)	Indicates the number of out-of-order packets, in bytes.
packets of data after window( bytes)	Indicates the number of packets outside the receiving window, in bytes.
packets received after close	Indicates the number of packets that are received after the TCP connection is closed.
ACK packets (bytes)	Indicates the number of ACK packets, in bytes.
duplicate ACK packets	Indicates the number of duplicated ACK packets.
too much ACK packets	Indicates the number of ACK packets after which no data packets are sent.
Sent packets	Indicates the number of sent packets.
urgent packets	Indicates the number of urgent packets.
control packets (RST)	Indicates the number of control packets (RST packets).
data packets	Indicates the number of data packets.
data packets retransmitted (0 bytes)	Indicates the number of retransmitted data packets, in bytes.
ACK only packets (delayed)	Indicates the number of delayed ACK packets.
Retransmitted timeout	Indicates the number of times that the retransmission timer times out.
connections dropped in retransmitted timeout	Indicates the number of connections that are torn down because the retransmission times exceed the limit.
Keepalive timeout	Indicates the number of times that the Keepalive timer times out.
keepalive probe	Indicates the number of sent Keepalive probe packets.
Keepalive timeout, so connections disconnected	Indicates the number of connections that are torn down because the Keepalive probe fails.
Initiated connections	Indicates the number of initiated connections.
accepted connections	Indicates the number of accepted connections.
established connections	Indicates the number of established connections.
Closed connections(dropped, initiated dropped)	Indicates the number of connections that have been closed.
Packets dropped with MD5 authentication	Indicates the number of packets that are discarded because they fail to pass the MD5 authentication.
Packets permitted with MD5 authentication	Indicates the number of packets that pass the MD5 authentication.
Send Packets permitted with Keychain authentication	Indicates the number of sent packets with Keychain option.
Receive Packets permitted with Keychain authentication	Indicates the number of received packets that pass the Keychain option authentication.
Receive Packets Dropped with Keychain authentication	Indicates the number of received packets that fail to pass the Keychain option authentication.