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There's two utilities I'm familiar with that scan your firewall for open
ports: Nessus and nmap. Of course, this is only for starters. As far as the
services on those ports, you can always turn them off, such as with telnet.
In some distros, it is default off. No service, no entry point. You can also
check your process tree (on the command line: ps faux) for services that
might have open ports.
You can look at Derek Glidden's presentation about security in general on the
this site: http://www.illusionary.com/~dglidden/linux-fw/ . It's really
pretty good!
You can also check the Firewall HOWTO on www.tldp.org...
Hope this gets you started!
Russell
On Monday 22 April 2002 12:00 pm, you wrote:
> I am kinda young in the LINUX world and I have lots of questions to ask.
> So, I thought this was the best place to ask them.
>
> I know that Red Hat comes with a firewall. When you activate it how do you
> know the firewall is blocking all of the ports. For example, if you want
> to block people from ftping to or from your site you tell the firewall to
> block ports 22 and 23 (something like that). I understand that but what I
> don't understand is that there are more ports that are being used by the
> system and the system is waiting for a call by the programs using the
> ports. So, how do you know that ALL the ports are being blocked so that
> ONLY valid usage is being used and no hackers in your system?
>
>
> William
- --
Linux -- the OS for the Renaissance Man
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