Server dependencies Post: 302650503

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Top Forums UNIX for Dummies Questions & Answers Server dependencies Post 302650503 by frappa on Sunday 3rd of June 2012 09:12:37 AM

06-03-2012

Registered User

Hi,

not very clear what are you really looking for, but maybe this can help:
If you're trying to look for what network services the server is acting as a client (that is, applications running on the server that are acting as clients with regard to some network services):
1. netstat: look at external ports/services the server has in state ESTABLISHED or CLOSE_WAIT; run this command if you have a login account on the server. You could find services provided by the server itself (i.e. applications from the monitored server connecting to TCP/UDP sockets on the server itself).
2. a network traffic sniffing tool (i.e. tcpdump, wireshark, etc.) may also do the job, provided they are run for a sufficiently long time (many applications may have permanet traffic with external services while others may just connect once in a while). You don't have to run tcpdump or wireshark on the machine itself, as long as you have a machine in the same subnet as the server you are monitoring with a network interface capable of 'promiscuous mode'.

When you asked for nmap usage, remember that nmap is generally used to discover what network services are listening on the target server. Unless you run nmap on the target server itself, the results returned by nmap may be less comprehensive than the results returned by running netstat (this time, you would look to results with TCP/UDP sockets in state LISTENING), because a firewall may filter some sockets.

see ya
fra

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LEARN ABOUT DEBIAN

pnscan

PNSCAN(1)																 PNSCAN(1)

NAME

       pnscan - multi threaded port scanning tool

SYNOPSIS

       pnscan [ options]  [ <CIDR | host-range> <port-range>]

       pnscan [ options]  [ <port>]

DESCRIPTION

       This manual page documents briefly the pnscan command.

       pnscan is a tool that can be used to survey TCP network services.

       When  used with two command line arguments it will scan the indicated network/hosts and ports. When used without arguments or just one then
       it will read hostname/IP addresses from stdin and probe those. The single port/service argument is used as a default if no  port  is  indi-
       cated on stdin

       For example, it can be used to survey the installed versions of SSH, FTP, SMTP, Web, IDENT and possibly other services.

       This   program	implements   a	 multithreaded	 TCP   port   scanner.	  More	 information   and   new   relaseses   may  be	found  at:
       http://www.lysator.liu.se/~pen/pnscan

OPTIONS

       -h     Show summary of options.

       -v     Be verbose.

       -V     Print version.

       -d     Print debugginf info.

       -s     Lookup and print hostnames.

       -S     Enable shutdown mode.

       -l     Line oriented output.

       -w<string>
	      Request string to send.

       -r<string>
	      Response string to look for.

       -W<hex list>
	      Hex coded request string to send.

       -R<hex list>
	      Hex coded response string to look for.

       -L<length>
	      Max bytes of response to print.

       -t<msecs>
	      Connect/Write/Read timeout.

       -n<workers>
	      Concurrent worker threads.

SEE ALSO

       nmap (1) and ipsort (1).

AUTHOR

       pnscan was written by Peter Eriksson <pen@lysator.liu.se>.

       Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.1 or
       any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts and no Back-Cover Texts.

								   25 March 2002							 PNSCAN(1)