Allied Telesis AT-S63 - Manual (Page 172)

Chapter 9: Networking Stack
172 Section I: Basic Operations
This menu is for viewing purposes only. The Display TCP Connections
menu contains the following information:
Total Number of TCP Listening sockets
The number of active listening sockets. There can be a maximum of
three listening sockets. One is for the Telnet server, another for SSH,
and the last for the web browser server. If a server is disabled, its
listening socket does not appear in the table.
Total Number of TCP connections
The number of active Telnet, SSH, and web browser connections to
the switch.
Index
The internal socket ID number assigned to the connection.
Local Address
The IP address of the switch, followed by the TCP port number used
by the switch for the connection. The two values are divided by a
colon, as illustrated in Figure 54. The port number indicates the type of
TCP connection. A port number of 23 indicates a Telnet connection, 22
an SSH connection, and 80 or 443 a web browser HTTP or HTTPS
connection, respectively.
Figure 54. IP Address and TCP Port Number
Foreign Address
The IP address of the management workstation that initiated the
connection, followed by the station’s TCP port number.
State
The state of the TCP connection. The TCP states are:
ˆ LISTEN - Waiting for a connection request from any remote TCP
and port.
ˆ SYN-SENT - Waiting for a matching connection request after
having sent a connection request.
ˆ SYN-RECEIVED - Waiting for a confirming connection request
acknowledgment after having both received and sent a connection
request.
ˆ ESTABLISHED - An open connection between the switch and the
management workstation. This is the normal state for the data
transfer portion of the connection.
ˆ FIN-WAIT-1 - Waiting for a connection termination request from
169.254.37.1:23
IP Address
TCP Port
Number