Allied Telesis AT-S62 - Manual (Page 368)

Chapter 20: Networking Stack
368 Section II: Advanced Operations
This table is for viewing purposes only. The columns in the table are
defined here.
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 128. 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 128. 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. A state of ESTABLISHED signals a
successful TCP connection between the switch and the management
workstation. For definitions of the TCP states, refer to RFC-793.
The entries for the listening sockets for the Telnet, SSH, and web
browser servers are identified in the table with a TCP state of LISTEN.
If you disable a server on the switch, its corresponding LISTEN entry is
removed from the table. Disabling all the servers leaves the table
empty. (The SSH server is disabled by default on the switch.)
The example in Figure 127 on page 367 shows that the Telnet and
web browser servers are active on the switch. The table also includes
two active TCP connections. Entry 4 is for a Telnet connection and
entry 24 is for a web browser HTTP connection.
169.254.37.1:23
IP Address
TCP Port
Number