Troubleshooting IP Performance 81
Troubleshooting IP
Performance
Fault: IP layer protocol works normally but TCP and UDP cannot work normally.
Troubleshoot: In the event of such a fault, you can enable the corresponding
debugging information output to view the debugging information.
■ Use the display command to view the running information of IP performance
and make sure that the PCs used by the user is running normally.
■ Use the terminal debugging command to output the debugging information
to the console.
■ Use the debugging udp packet command to enable the UDP debugging to
trace the UDP packet.
The following are the UDP packet formats:
UDP output packet:
Source IP address:202.38.160.1
Source port:1024
Destination IP Address 202.38.160.1
Destination port: 4296
task = ROUT(15)
socketid = 6,
src = 192.168.1.1:520,
dst = 255.255.255.255:520,
datalen = 24
■ Use the debugging tcp packet command to enable the TCP debugging to
trace the TCP packets.
Operations include:
<SW8800> terminal debugging
<SW8800> debugging tcp packet
Then the TCP packets received or sent can be checked in real time. Specific packet
formats include:
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
task = ROUT(15)
socketid = 5
state = Established
src = 172.16.1.2
Source port:1025
dst = 172.16.1.1
Destination port: 4296
seq = 1921836502
ack = 4192768493
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