Operation Manual – IP Address and Performance Confiugration
Quidway S3900 Series Ethernet Switches-Release 1510
Chapter 2 IP Performance Configuration
Huawei Technologies Proprietary
2-4
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.
z Use the display command to display the IP performance and check whether
the PC runs normally.
z Use the terminal debugging command to enable debugging information to
be output to the console.
z 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
z 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
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