Server dependencies Post: 302650623

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Top Forums UNIX for Dummies Questions & Answers Server dependencies Post 302650623 by frappa on Monday 4th of June 2012 03:50:59 AM

06-04-2012

Registered User

Hi,

sorry for not being too clear.

netstat can be used in order to look both for services provided by the monitored server and external services for which the server is acting as a client.
Actually netstat output reports both 'Local address' and 'Foreign address' columns: the former is for local network sockets, while the latter is for 'external' network sockets.
When I stated "[...]You could find services provided by the server itself[...]", I meant that you could discover services for which the server is acting both as a server and as a client (trivial case: think about SSHing to the server itself).

I also didn't mention that for UDP traffic for which the server acts as a client with respect to an external service provide, you may never see a corresponding row in netstat output, because UDP connections are stateless by design (for exceptions have a look at: networking - netstat -na : udp and state established? - Stack Overflow that is, netstat output will show UDP sockets just for services for which the server is actually acting as a server.
So, in order to see if an application is using DNS (implemented as a service listening on UDP port 53 on the server side) you'd better use a network traffic sniffing tool.

see ya
fra

Last edited by frappa; 06-04-2012 at 04:51 AM.. Reason: correcting some typos

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LEARN ABOUT SUNOS

in.echod

in.echod(1M)						  System Administration Commands					      in.echod(1M)

NAME

       in.echod - UDP or TCP echo protocol service daemon

SYNOPSIS

       in.echod

       FMRI
       svc:/internet/echo:default

DESCRIPTION

       FMRI  stands  for  Fault  Management  Resource  Identifier.  It is used to identify resources managed by the Fault Manager. See fmd(1M) and
       smf(5).

       The in.echod service provides the server-side of the echo protocol. This protocol is used for debugging and bandwidth  measurement  and	is
       available on both TCP and UDP transports, through port 7.

       The in.echod service is an inetd(1M) smf(5) delegated service. The in.echod detects which transport is requested by examining the socket it
       is passed by the inetd daemon.

       TCP-based service

	   Once a connection is established, the in.echod echoes any data received from the client back to the	client.  The  server  echoes  data
	   until the client program terminates the connection.

       UDP-based service

	   The	in.echod listens for UDP datagrams. When a datagram is received, the server creates a UDP datagram containing the data it received
	   and sends it to the client.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNW			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       inetd(1M), attributes(5), smf(5)

       RFC 862

SunOS 5.10							    23 Aug 2004 						      in.echod(1M)