display tcp ipv6 statistics

Function

The display tcp ipv6 statistics command displays TCP6 traffic statistics.

Format

display tcp ipv6 statistics

Parameters

None

Views

All views

Default Level

1: Monitoring level

Usage Guidelines

Usage Scenario

You can check the network connection status according to the items in the command output, for example:

Established connections: indicates the number of established connections, helping you determine whether to continue deploying services such as BGP services or adjust the load.
Duplicate ACK packets: indicates whether the device is attacked by unknown ACK packets. If the device receives a large number of unknown ACK packets, the device may be attacked.
Out-of-order packets: allows you to check network performance. If the network is in poor condition, a lot of out-of-order packets are generated.

Precautions

The total number of received packets includes the number of forwarded packets, number of packets delivered to the upper layer, and number of discarded packets.
Before running this command to view TCP6 statistics within a specified period, run the reset tcp ipv6 statistics command to clear existing statistics.

Example

# Display TCP6 packet statistics.

<HUAWEI> display tcp ipv6 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 with data after window: 0 (0 bytes)                                
     packets after close: 0                                                     
     ACK packets: 0 (0 bytes)                                                   
     duplicate ACK packets: 0                                                   
     too much ACK packets: 0                                                    
     packets dropped due to MD5 authentication failure: 0                       
     packets dropped due to absence of MSO: 0                                   
     packets dropped due to presence of MSO: 0                                  
     packets received with MD5 Signature Option: 0                              
                                                                                
Sent packets:                                                                   
     total: 0                                                                   
     urgent packets: 0                                                          
     total(64bit high-capacity counter): 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)                                            
     packets sent with MD5 Signature Option: 0                                  
                                                                                
Other Statistics:                                                               
     retransmitted timeout: 0                                                   
     connections dropped in retransmitted timeout: 0                            
     keepalive timeout: 0                                                       
     keepalive probe: 0                                                         
     keepalive timeout, so connections disconnected: 0                          
     initiated connections: 0                                                   
     accepted connections: 0                                                    
     established connections: 0                                                 
     closed connections: 1 (dropped: 0, initiated dropped: 0)

**Table 1** Description of the **display tcp ipv6 statistics** command output
Item	Description
Received packets: total	Total number of received packets.
packets in sequence	Number of packets received in sequence.
window probe packets	Number of received window probe packets.
window update packets	Number of received window update packets.
checksum error	Number of received packets received with invalid checksum.
offset error	Number of received packets with incorrect TCP header length.
short error	Number of received packets with total length shorter than the set value in the packet header.
duplicate packets	Number of received duplicate packets.
partially duplicate packets	Number of received partially duplicate packets.
out-of-order packets	Number of received out-of-order packets.
packets with data after window	Number of received packets exceeding the receive window.
packets after close	Number of packets received after the connection is closed.
ACK packets	Number of received ACK packets.
duplicate ACK packets	Number of received duplicate ACK packets.
too much ACK packets	Number of received ACK packets with too large ACK values.
Sent packets: total	Total number of sent packets.
urgent packets	Number of sent packets with the urgent pointer.
control packets	Number of sent control packets.
window probe packets	Number of sent window probe packets.
window update packets	Number of sent window update packets.
data packets	Number of sent data packets.
data packets retransmitted	Number of retransmitted data packets.
ACK only packets	Number of sent ACK only packets.
Other Statistics	Other statistics.
retransmitted timeout	Number of retransmission timeout packets.
connections dropped in retransmitted timeout	Number of disconnected connections during the retransmission timeout.
keepalive timeout	Number of Keepalive timeouts.
keepalive probe	Number of Keepalive probes.
keepalive timeout, so connections disconnected	Number of connections disconnected due to Keepalive timeout.
initiated connections	Number of initiated connections.
accepted connections	Number of accepted connections.
established connections	Number of established connections.
closed connections	Number of closed connections.
dropped	Number of disconnected connections.
initiated dropped	Number of initiated and disconnected connections.