Enable Firewall, But Allow Specific Inbound Connections

[micheal]

On Sun, 2005-01-30 at 04:53 -0500, Robert L Cochran wrote:
> Gain Paolo Mureddu wrote:
> 
> > Robert L Cochran wrote:
> >
> >> On Fedora Core 3, I want to enable the firewall, permitting inbound 
> >> TCP connections from anywhere on port 80. I also want to allow 
> >> inbound connections on port 3306 but only from hosts 192.168.1.1 and  
> >> 192.168.1.2.
> >>
> >> It looks like I can't do this from the Applications --> System 
> >> Settings --> Security Level GUI. I can allow ports 80 and 3306, but 
> >> it doesn't look like I can limit the port 3306 connections to just 2 
> >> specific hosts. I would have to craft an IPTABLES script. Am I right 
> >> here, and if so, what would be the right way to add specific IPTABLES 
> >> rules without interfering with the Security Level applet?
> >>
> >> Thanks
> >>
> >> Bob Cochran
> >> Greenbelt, Maryland, USA
> >>
> > I (as the other posters) will recommend you to learn iptables, and if 
> > you want a very easy way to configure your firewall and build *quite* 
> > complex per-interface rule sets, I'd strongly recommend you take a 
> > look at fwbuilder (there are the packages for it in the pre-extras 
> > repo [http://fedoraproject.org/pre-extras])
> >
> Thank you. How do I implement iptables rules without interfering with 
> what the Security Level applet sets?
> 
> Bob
> 

Very simply, open up a terminal, su over to root.  Add the iptables
rules tgat you want.  

When you are finshed, service iptables save will make them permanent

MC