User's Manual

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show tcp
Displays all TCP connection status information
show tcp brief
Briefly displays information about TCP
connection states.
show tcp statistics
Displays the statistics data about TCP
show tcp tcb address
Displays information about the designated TCP
connection state.
(4) Displaying Debug Information
When problem occurs on the network, you can run debug to display the debugging information.
Run the following command in EXEC mode. For details, refer to “IP Service Command”.
Command Purpose
debug arp
Displays the interaction information about ARP.
debug ip icmp
Displays the interaction information about ICMP.
debug ip raw
Displays the information about received/transmitted
Internet IP message.
debug ip packet
Displays the interaction information about IP.
debug ip tcp packet
Displays the interaction information about TCP.
debug ip tcp transactions
Displays the interaction information about TCP.
debug ip udp
Displays the interaction information about UDP.
53.2 Configuring Access List
53.2.1 Filtering IP Packet
Filtering message helps control the movement of packet in the network. The control can limit network
transmission and network usage through a certain user or device. To make packets valid or invalid through the
crossly designated interface, our routing SWITCH provides the access list. The access list can be used in the
following modes:
 Controlling packet transmission on the interface
 Controlling virtual terminal line access
 Limiting route update content
The section describes how to create IP access lists and how to use them.
The IP access list is an orderly set of the permit/forbid conditions for applying IP addresses. The ROS software
of our SWITCH tests the addresses one by one in ACL. The first match determines whether the ROS accepts
or declines the address. After the first match, the ROS software terminates the match regulations. The order
of the conditions is, therefore, important. If no regulations match, the address is declined.