Opening, blocking and changing ports on RedHat

[keith smith]

Ok,  Thanks!  No GUI on these boxes. All CL.

------------------------

Keith Smith

--- On Tue, 1/4/11, JD Austin <jd at twingeckos.com> wrote:

From: JD Austin <jd at twingeckos.com>
Subject: Re: Opening, blocking and changing ports on RedHat
To: "Main PLUG discussion list" <plug-discuss at lists.plug.phoenix.az.us>
Date: Tuesday, January 4, 2011, 1:02 PM

Yes however you can open the port from the GUI under system-> administration -> security level and firewall
if you don't want to poke around on the command line.Likely the reason you don't have to open the special service for ssh is that sshd is a trusted service.
JD
On Tue, Jan 4, 2011 at 12:52, keith smith <klsmith2020 at yahoo.com> wrote:



Hi,


I'm working on several CentOS and one RHEL servers.  I needed to open a port the other day so I did a search and the info I found lead me to believe the only way to open or close a port was via iptables.  Is that the complete story?


For example, if I want to open port 3306 for MySql I need two things?  1) The port needs to be listed in /etc/services (RedHat) and 2) the port needs to be opened via iptables.

If I use a non-standard port (3306) I must add a line to the /etc/my.conf that defines the port such as "port=xxxx".


Here is a twist.  I set my SSHD to port 2200 but did not change /etc/services, which lists ici on port 2200 for both tcp and udp.  I am able to shell in using port 2200.  Why no conflict?

Thank you for your insight.




------------------------

Keith Smith


      
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