3Com 10014298 manual SW7750terminal debugging SW7750debugging tcp packet

IP Performance 79

Troubleshooting IP If the IP layer protocol works normally, but TCP and UDP do not work normally, Performance you can enable the corresponding debugging information output to view the

debugging information.

■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. When the router sends or receives UDP packets, the content format of the packet can be displayed in real time. You can locate the problem from the contents of the 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

■Use the debugging tcp packet or debugging tcp transaction command to

enable the TCP debugging to trace the TCP packets. There are two available ways for debugging TCP.

■Debug and trace the packets of the TCP connection that take this device as one end.

Operations include:

<SW7750>terminal debugging

<SW7750>debugging tcp packet

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

■Debug and trace the packets located in SYN, FIN or RST.

Operations include:

<SW7750>terminal debugging

<SW7750>debugging tcp transact

The TCP packets received or sent can be checked in real time, and the specific packet formats are the same as those mentioned above.

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