Huawei Quidway S3900 Series Operation Manual page 128

Operation Manual – IP Address and Performance Confiugration
Quidway S3900 Series Ethernet Switches-Release 1510
2.3 Troubleshooting
Symptom: IP packets are forwarded normally, but TCP and UDP cannot work
normally.
Solution: Enable the corresponding debugging information output to view the
debugging information.
Use the display command to display the IP performance and check whether
the PC runs normally.
Use the terminal debugging command to enable debugging information to
be output to the console.
Use the debugging udp packet command to enable the UDP debugging to
trace UDP packets.
<Quidway> terminal debugging
<Quidway> debugging udp packet
The UDP packets are shown in the following format:
UDP output packet:
Source IP address:202.38.160.1
Source port:1024
Destination IP Address 202.38.160.1
Destination port: 4296
Use the debugging tcp packet command to enable the TCP debugging to
trace TCP packets.
<Quidway> terminal debugging
<Quidway> debugging tcp packet
Then the TCP packets received or sent will be displayed in the following format in
real time:
TCP output packet:
Source IP address:202.38.160.1
Source port:1024
Destination IP Address 202.38.160.1
Destination port: 4296
Sequence number :4185089
Ack number: 0
Flag :SYN
Packet length :60
Data offset: 10
Huawei Technologies Proprietary
2-4
Chapter 2 IP Performance Configuration