09-06-2003
What do you mean by opening a port?
If an application server binds to the port to listen incoming traffic or have to send out any messages, the port must be open. Otherwise, it is closed. I don't think you will manually open a port.
Or do you mean to configure the firewall to enable certain ports that are otherwise blocked by default?
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1. Cybersecurity
/* 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... (10 Replies)
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2. UNIX for Advanced & Expert Users
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
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3. Shell Programming and Scripting
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... (2 Replies)
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4. AIX
Hi Every body,
What is the command on AIX 5.2 that can be used to get all open ports? (2 Replies)
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5. UNIX for Dummies Questions & Answers
Hello,
I have a number of Solaris 8 Sun servers that have open ports that I cannot identify. I see some with 1012-1020 (which are reserved ports according to the IANA. Lsof does not identify these. One server has all these on and one server just has 1017.
*.1023 ... (3 Replies)
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6. Solaris
Hello,
I have a number of Solaris 8 Sun servers that have open ports that I cannot identify. I see some with 1013-1023 (which are reserved ports according to the IANA. Lsof does not identify these. I rebooted the server and they went off, but this morning I saw they were all back on again. Any... (1 Reply)
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7. Solaris
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 ! (1 Reply)
Discussion started by: cromohawk
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8. UNIX for Dummies Questions & Answers
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 ... (1 Reply)
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9. IP Networking
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
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LEARN ABOUT DEBIAN
rsuplnk
RSUPLNK(8) Linux Programmer's Manual RSUPLNK(8)
NAME
rsuplnk - User entry into the ROSE network.
SYNOPSIS
rsuplnk [-q] <port>
DESCRIPTION
The rsuplnk program allows a user to gain entry into the ROSE network using the standard pseudo-digipeating method. Recent Linux kernels
are aware of this form of operation and the ax25d program can listen for such connections. The normal mode of operation of a ROSE switch is
to have one ROSE address (ie port) per physical AX.25 port. Therefore ROSE users coming in on a given AX.25 port will appear as if they
come from the associated ROSE port. This is the reason for the need for a ROSE port as an argument.
To use rsuplnk you need an entry in ax25d.conf to listen for incoming connections. In the example below, I will be listening for ROSE con-
nections on my AX.25 port 144 using the callsign KE4GAJ-10 and the ROSE port associated with the AX.25 port is rs144.
#
[KE4GAJ-10* VIA 144]
NOCALL * * * * * * L
default * * * * * * - root /usr/sbin/rsuplnk rsuplnk rs144
#
There would typically be one rsuplnk per user access AX.25 port. The associated program for exiting a ROSE network is rsdwnlnk.
All errors generated by rsuplnk are written to the system debug log file.
OPTIONS
-q Supresses the messages generated by rsuplnk when making the connection.
FILES
/etc/ax25/rsports
SEE ALSO
rose(4), ax25d.conf(5), ax25d(8), rsdwnlnk(8), rose_call(8).
AUTHOR
Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>
Linux 29 April 1997 RSUPLNK(8)