[CentOS] CentOS-6 firewall how to open a port

[Ljubomir Ljubojevic]

Timothy Murphy wrote:
> I'm running CentOS-6 on an HP MicroServer (since this morning)
> and I'd like to open an non-standard port,
> for use on a laptop  attached to the internet through the server.
> 
> Do I have to explicitly add an iptables rule?
> If so, and I want to open (say) udp port 500 ,
> what command should I give?
> 
> I've always used shorewall in the past,
> and will probably do so now if the default firewall is difficult to use.
> But I thought I would try it first as an experiment.
> 
> My recollection is that in old versions of CentOS
> one could non-standard ports through system-config-firewall ;
> but it seems that now this can only be used for standard ports;
> 
> I looked at <http://wiki.centos.org/HowTos/Network/IPTables>
> but didn't find it very enlightening.
> 
> Any advice or suggestions gratefully received.
> 

Use System -> Administration -> Firewall from GUI.
Or "/usr/bin/system-config-firewall" from SSH/console TUI.

Ljubomir