CentOS - Jan 2006 - firewall and opening ports

Hi list. This is my first post here. Super newbie. I will try not to  
ask too many questions, but searching is hard when you don't even  
know where to begin. Hopefully someone can point me in the right  
direction.

I have just installed CentOS 4.2. I selected to have a firewall in  
the graphic installer, and I opened ports 22 and 80. Fine so far. SSH  
and HTTP both work. But now that everything is set up I have  
discovered I need to open port 53 in order to install djbdns.

My main question is: what did I install by choosing to have a  
firewall in the CentOS installer? Is this iptables? Or is it  
something else?

And then if anyone just wants to give me the complete answer: how do  
I open port 53?

Thanks!

you will find iptables here
/etc/sysconfig/iptables

edit the file by using the gui on you desktop or as root
#system-config-securitylevel-tui

open the ports, input in the field
53:tcp 53:udp

you will find info about this in the system administration guide chapter 19


jim at datamantic.com wrote:
> Hi list. This is my first post here. Super newbie. I will try not to  
> ask too many questions, but searching is hard when you don't even  know
> where to begin. Hopefully someone can point me in the right  direction.
> 
> I have just installed CentOS 4.2. I selected to have a firewall in  the 
> graphic installer, and I opened ports 22 and 80. Fine so far. SSH  and 
> HTTP both work. But now that everything is set up I have  discovered I 
> need to open port 53 in order to install djbdns.
> 
> My main question is: what did I install by choosing to have a  firewall 
> in the CentOS installer? Is this iptables? Or is it  something else?
> 
> And then if anyone just wants to give me the complete answer: how do  I 
> open port 53?
> 
> Thanks!
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