Specifications

WAN/LAN Management Nur für den internen Gebrauch
A31003-H3580-M103-2-76A9, 01-2009
C-8 HiPath 3000/5000 V8 - HG 1500 V8, Administrator Documentation
hg-c.fm
Utility Programs for TCP/IP Diagnostics
In order to determine which data can be collated using the above example, we will now explain
the procedure step by step.
The first two entries are in the "LISTENING" state, that is two programs (servers) have been
started on the local computer, both of which are waiting for a client to establish a connection
with them. Both are connected to the IP address "0.0.0.0". This IP address indicates that the
server is connected to all available network interfaces. Even if only one network card is in-
stalled, this already has two interfaces, that is the local network card (192.168.129.3) and the
loopback interface "127.0.0.1" which is installed as standard by Windows. In this example, a
HTTP server (Port 80) and an SMTP server (Port 25) are running on the local computer. In or-
der to determine whether the network card is working correctly, send a test ping from the local
computer, e.g. ping 192.168.129.3. Any error message triggered by this test indicates an
incorrectly configured network interface. If you wish to test the connection to the local HTTP
server for example , simply use your Web browser and enter the URL https://127.0.0.1
or https://192.168.129.3. Entering "telnet localhost 25" or "telnet 192.168.129.3 25" al-
lows a connection to be established to the local SMTP server. In this case, the port (that is the
application) is specified using 25.
The next three entries are all active connections. These can be established either from the local
to the remote computer, or from the remote to the local computer.
In order to distinguish between an incoming and an outgoing connection, the entries contained
in the "LISTENING" state (server) are required. To do this, you need to check whether the port
specified for the local computer is running on the local computer itself. The first line shows port
"1037". This port is not running as a server (LISTENING) on the local computer
(192.168.129.3). Thus this must be a connection from the local computer to a remote computer
(192.168.129.1) with the port "110" (POP3). In other words, the local computer is in the process
of downloading its e-mails from the POP3 server.
The second entry must also be an outgoing connection, as it is also not in the "LISTENING"
state on the local computer. The local computer has therefore set up a connection to the com-
puter "192.168.129.2" and port "23" (Telnet). This means that the local computer has opened
a Telnet session on the remote PC.
In the third entry, the local port "80" (HTTP) corresponds to that of a server. Thus the remote
computer 192.168.129.1 is in the process of opening Web pages on the local computer.
Proto Local address Remote address Status
TCP 0.0.0.0:80 0.0.0.0:0 LISTENING
TCP 0.0.0.0:25 0.0.0.0:0 LISTENING
Proto Local address Remote address Status
TCP 192.168.129.3:1037 192.168.129.1:110 ESTABLISHED
TCP 192.168.129.3:1038 192.168.129.2:23 ESTABLISHED
TCP 192.168.129.3:80 192.168.129.1:1039 ESTABLISHED