Re: [SLUG] More Firewall Fun

From: Smitty (76543a@mpinet.net)
Date: Fri Jul 06 2001 - 20:01:20 EDT


Hey! Don't forget nmapfe, the gui front end for nmap. Very nice tool for
scanning novices. There should be links at insecure.org to get nmapfe.
Smitty

On Friday 06 July 2001 10:24, you wrote:
> I'm planning to give an ipchains/iptables presentation at the Wed Tampa
> SLUG meeting if you want to be there. I'll try to cover all of this
> stuff.
>
> Essentially though, the very first rule of firewalling is "Deny by
> default." Which means deny EVERYTHING through the firewall UNLESS you
> know FOR SURE that it should be allowed.
>
> And that tool I used was called "nmap". You can get it at:
>
> http://www.insecure.org/nmap/
>
> I usually just slap the ipchains script in root's home directory and
> make a ln to it from the appropriate rc.d directory.
>
> Russell Hires wrote:
> > Hey everyone,
> >
> > I know we just had a major firewall discussion, but I'm just late, I
> > guess... ;-)
> >
> > I remember at the CTS Derrick was chock full of info on the firewall he
> > had set up. So, I've been reading the Firewall HOWTO and the Ipchains
> > HOWTO, and I've got some questions...
> > I guess this is to Derrick, but anyone else feel free to chime in...
> >
> > First, what were the services you disabled? The HOWTOs say time and
> > discard and a few others are internal services. What do they do?
> >
> > Second, what software did you use to scan the other machine that you
> > pointed out that didn't have some of those services disabled?
> >
> > Third, where do you keep the ipchains script? For me, it seems that
> > Debian has got some default rules and thus a default script, but I don't
> > exactly know where to find it...well, I guess I don't need to know to
> > edit it, because there is a utility called, aptly, "ipchains," so I
> > should just be able to type (from the command line) "ipchains -A
> > <chain>", at least according to the man page...
> >
> > Thanks!
> >
> > Russell



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