[CentOS] Firewall frustration

Fri Jan 4 14:49:51 UTC 2008
Robert Moskowitz <rgm at htt-consult.com>

qsm wrote:
> maybe shorewall can do your live so easy.....
It does not support the rtl8150 chipset.  That is what the I have in the 
way of USB ethernet dongles.

Which is another reason to go with a Centos based solution when you need 
to put something up as you go.
>
> -- 
>
>
> *---------- Original Message -----------*
> From: Robert Moskowitz <rgm at htt-consult.com>
> To: CentOS mailing list <centos at centos.org>
> Sent: Thu, 3 Jan 2008 08:03:09 -0500
> Subject: Re: [CentOS] Firewall frustration
>
> > Christopher Chan wrote:
> > >
> > >> I tried it. I had everything open. Then I blocked everything. Then I
> > >> set up a rule to allow SSH in to eth0 and out eth1 (and the other
> > >> way). At least I thought that was what the rules said, but no SSH
> > >> connectivity through the firewall. That was when I realized that I
> > >> had not found the necessary incantation, and I had already shot most
> > >> of tuesday.
> > >>
> > >
> > > Too bad you missed the documentation on netfilter then.
> > And that is the crux of the problem. Finding the right 
> documentation....
> >
> > And to look at documentation on netfilter besides iptables.
> > > It would have told you that the INPUT chain controls what comes to 
> the
> > > box, the OUTPUT chain what originates from the box and the FORWARD
> > > chain what goes through the box.
> > >
> > > You would have needed a rule in FORWARD to allow ssh connections
> > > through the box. The rules in the INPUT and OUTPUT chains would have
> > > zero effect on connections going through.
> > >
> > > Anyways, you have something now but in case you want to give iptables
> > > another go...
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> *------- End of Original Message -------*
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