Checking open ports in a system Post: 302999261

Sponsored Content

Operating Systems Linux Red Hat Checking open ports in a system Post 302999261 by anaigini45 on Friday 16th of June 2017 06:00:03 AM

06-16-2017

Registered User

Checking open ports in a system

Hi,

There are two servers which needs to be connected via the port number 1521 from a remote server.

This is the port config in the first server : L28tstream1 :

Code:

[root@L28tstream1 ~]# netstat -tulpn | grep 1521
tcp        0      0 10.67.26.183:1521           0.0.0.0:*                   LISTEN      23988/tnslsnr
[root@L28tstream1 ~]#

This is the port config in the 2nd server : L28stream2 :

Code:

[root@L28stream2 ~]# netstat -tulpn | grep 1521
tcp        0      0 :::1521                     :::*                        LISTEN      24017/tnslsnr
[root@L28stream2 ~]#

As you can see, the way the port is open in both the servers above is different. For the first server, the port is stated with the ip address, whereas for the 2nd one this is not the case.

Also for the first server, the "Foreign Address" column displays as 0.0.0.0:* whereas for the 2nd one it just has some dots like :::*.

How are the lines above configured for each server to look like how they look above? What do the differences mean? What do the dots indicate?

anaigini45

View Public Profile for anaigini45

Find all posts by anaigini45

9 More Discussions You Might Find Interesting

1. Cybersecurity

closing open ports

/* Linux Slackware */ Nmap shows the following ports open on the gateway. 21/tcp ftp 22/tcp ssh 23/tcp telnet 25/tcp smtp 37/tcp time 80/tcp http 113/tcp auth 515/tcp printer 587/tcp submission 1024/tcp kdm 6000/tcp x11 ------------------------------- i would like to close as...

2. Linux

How To Open Ports in RedHat ?

how can i open ports i need in red hat server vs root access ?

3. Programming

Serial Ports - locking them, checking if they are open

Hi, I'm trying to fix up some serial code that was given to me by a coworker no longer on the project. Problem is, when the program is running and reading the port, I can take away the port by doing a cu command in another terminal window. When I release the cu, the program crashes, I think...

4. UNIX for Advanced & Expert Users

determining open ports

hi all 1) how to determine available ports in a box (solaris) do i have to go for a netstat on all the ports? 2) how to block a particular port for a particular type of connection. Any help would be greatly appreciated Thanks

5. Shell Programming and Scripting

Check open ports every ...

Hello, i need a script (bash type maybe?..), which would check open ports on 127.0.0.1 and then compare open ports with "registered/allowed" port list and try to kill the program who uses unregistered ports. It would be great that script would be started lets say every 5 or 10 minutes. You see i...

6. AIX

Open Ports on System

Hi Every body, What is the command on AIX 5.2 that can be used to get all open ports?

7. Solaris

Open ports in solaris 10

hi guys, may i know the exact steps to open a port in solaris.i have some rough idea - which is adding the port number in /etc/services. but i am not sure the correct conventions, steps or any other steps. kindly advise.thanks guys !

8. UNIX for Dummies Questions & Answers

open ports and services

just a quick question: a. whats the simplest command to check open port and the corresponding services? example: bash-2.05# netstat -an | grep LISTEN *.199 *.* 0 0 49152 0 LISTEN *.8989 *.* 0 0 49152 ...

9. IP Networking

Open/close of ports

Hi, I have read some forum theads about the open and close ports. some points are clear and it is not working on my machine or something am i missing? I have commented out a port /etc/services, one application uses then when i use the telnet <hostname> <port_blocked> it shows connected.....

LEARN ABOUT SUSE

xine-remote

XINE-REMOTE(1x) 														   XINE-REMOTE(1x)

NAME

       xine-remote - a small tool to connect xine remote control server.

SYNOPSIS

       xine-remote [options]

DESCRIPTION

       This manual page documents briefly the xine-remote tool.

       xine-remote  can  replace  a  raw  telnet  connection to a xine remote control server. It use the readline facilities (completion, vi/emacs
       shortcuts, command history, etc...).  By default, it try to connect the localhost, using the default port (see xine(1)).

OPTIONS

       The program follow the usual GNU command line syntax, with long ioptions starting with two dashes (`-').  A summary of options are included
       below.

       -H, --host <hostname>
	      Try to connect <hostname>.

       -P, --port <port>
	      Try to connect the host using <port>.

       -c, --command <command>
	      Send <command> to server then quit.  The command should be single quoted if it contain spaces or special characters.

       -n, --noconnect
	      Do not initiate the connection on startup.

       -v, --version
	      Display version.

       -h, --help
	      Display options summary.

COMMANDS

       Few commands are available, which are used to open or close a connection:

       ?      Display available commands (the xine-remote ones + server ones when connection is established).

       help <command>
	      Display the purpose of <command>, if that is omitted, display available commands.

       syntax <command>
	      Display the usage of <command>.

       version
	      Display version.

       open <server[:port]>
	      Open connection to server. A port can be optionally specified, using colon (:) separator.

       close  Close connection.

       quit   Leaving xine-remote.

SEE ALSO

       xine(1).

AUTHOR

       This manual page was written by Daniel Caujolle-Bert <f1rmb@users.sourceforge.net> for the xine project.

The xine project						    2002-04-16							   XINE-REMOTE(1x)