Specifications

Niagara Release 2.3
Revised: May 22, 2002 Niagara Networking & Connectivity Guide
Chapter 2 Configuration and Troubleshooting Tools
Connectivity Troubleshooting Utilities
2–26
or
netstat -n
where -n shows host information with IP addresses instead of names.
Example 2-1 shows an example of
netstat run at a command line of a Windows
2000 host called CLOBBER. It shows client connections open to many servers using
different server-side ports. In this example, CLOBBER is a Web Supervisor and
administration host and Saturn is a JACE-4/5.
Reference line information in the left column is used to facilitate the discussion
which follows the example.
Example 2-1 Netstat utility example.
The following things can be noted about this example:
• The protocol for each connection is TCP.
• The Local Address column lists the name of the local host (CLOBBER)
followed by the client-side port number opened for the connection.
• The Foreign Address column lists the name of the host that CLOBBER is
connected to and the port number opened on the server for the connection.
Sometimes a name is listed rather than the port number. The name is the default
function (as listed in Table 1-10 on page 1-31) associated with the port. For
example, in Line 3, CLOBBER is connected to Saturn via the file transfer
protocol (FTP) on default port 21.
• As indicated in line 5, CLOBBER has opened a connection to Saturn using the
Admin Tool on port 3011.
• CLOBBER (as a Web Supervisor) is running a Niagara station, but the default
port for the station has been changed to 8080. Lines 7 and 8 indicate that
CLOBBER has opened a browser or the JDE to the local station.
C:\>netstat
Active Connections
Reference Line
Proto Local Address Foreign Address State
1
TCP CLOBBER:4326 intrepid.getresponse.com:http CLOSE_WAIT
2
TCP CLOBBER:4332 Saturn:telnet ESTABLISHED
3
TCP CLOBBER:4397 Saturn:ftp ESTABLISHED
4
TCP CLOBBER:4504 popserv.mrf.mail.rcn.net:pop3 TIME_WAIT
5
TCP CLOBBER:4507 Saturn:3011 TIME_WAIT
6
TCP CLOBBER:4326 Saturn:3011 ESTABLISHED
7
TCP CLOBBER:4484 CLOBBER.tridium.net:8080 ESTABLISHED
8
TCP CLOBBER:4488 CLOBBER.tridium.net:8080 ESTABLISHED