display tcp ipv6 statistics
Usage Guidelines
Usage Scenario
Established connections: You can view information about "Established connections" to check whether the number of connections exceeds the upper limit, and then determine whether to continue deploying services such as BGP services or adjust the load.
Duplicate ACK packets: You can view information about "Duplicate ACK packets" to check 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: You can view information about "Out-of-order packets" 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 packets received by a routing device includes the number of forwarded packets, number of packets delivered by the routing device to the upper layer, and number of discarded packets.
Before running this command to view IPv6 TCP statistics within a specified period, run the reset tcp ipv6 statistics command to clear existing statistics.
Example
# Display IPv6 TCP packet statistics.
<AC6605> 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
packets dropped due to MAC authentication failure: 0
packets dropped due to absence of active receive key: 0
packets dropped due to invalid receive algorithm id: 0
packets dropped due to absence of Enhanced Authentication Option: 0
packets received with Enhanced Authentication 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
packets sent with Enhanced Authentication Option: 0
packets not sent due to absence of active send key: 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: 0 (dropped: 0, initiated dropped: 0)
Item |
Description |
|---|---|
Received packets: total: 0 |
Total number of received packets. |
total(64bit high-capacity counter) |
Total number of received or sent packets counted by the 64-bit high-capacity counter. |
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 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. |
packets dropped due to MD5 authentication failure |
Number of packets discarded due to MD5 authentication failure. |
packets dropped due to absence of MSO |
Number of packets discarded due to absence of MD5 Signature Option. |
packets dropped due to presence of MSO |
Number of packets discarded due to presence of MD5 Signature Option. |
packets received with MD5 Signature Option |
Number of received packets with MD5 Signature Option. |
packets dropped due to MAC authentication failure |
Number of packets discarded due to MAC authentication failure. |
packets dropped due to absence of active receive key |
Number of packets discarded due to absence of active receive key. |
packets dropped due to invalid receive algorithm id |
Number of packets discarded due to invalid receive algorithm ID. |
packets dropped due to absence of Enhanced Authentication Option |
Number of packets discarded due to absence of Enhanced Authentication Option. |
packets received with Enhanced Authentication Option |
Number of received packets with Enhanced Authentication Option. |
Sent packets: total: 0 |
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. |
packets sent with MD5 Signature Option |
Number of sent packets with MD5 Signature Option. |
packets sent with Enhanced Authentication Option |
Number of packets sent with Enhanced Authentication Option |
packets not sent due to absence of active send key |
Number of packets not sent due to absence of active send key |
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. |
