Virtual Private Server User Guide
Network Servers and Server Applications
The first section of this report, which is entitled "Active Internet Connections,"
displays the services that are being provided by your server and shows the
remote computers that are currently connected to those services. This section of
the report is divided into the following columns:
Proto The protocol used by the application. Transmission Control Protocol
(TCP) is used to ensure reliability and data integrity; User Datagram Protocol
(UDP) is used when speed and performance are more important than reliability, as
with audio and video streaming.
Recv Q and Send Q The size of the queue for incoming and outgoing data
packets, in bytes.
Local Address The hostname and port that the service is connected to, using
the format hostname.port.
Foreign Address The address and port from which the connection is being
made.
State The current status of the connection. The most common values are listed
below:
ESTABLISHED A connection is currently established for the associated service.
LISTEN The server is on standby, awaiting a connection to the associated
service.
TIME_WAIT The server is waiting for a specified time interval to elapse before
closing an open connection.
The second half of the report, entitled iActive UNIX domain sockets,i deals with a
different type of service available only to your server itself. These services include
the system logging facility and a connection that is used to increase the efficiency
of local connections to the MySQL database server.
For more information on the netstat command, type man netstat at your server's
command prompt.
Xinetd: The Super Daemon
Xinetd is a standalone application that listens on many different network ports and
executes (spawns) other server applications as needed. Xinetd is more secure
and powerful than the standard UNIX inetd application that you may be familiar
with.
By default, xinetd listens for the following services:
pop3
pop3s
imap4
imap4s
Technical Training Department
August 2004
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