[Cialug] Firewall question

[Tom Sellers]

Thank you for your response!  I have looked briefly at the link you sent.
Is there a way to look at the existing firewall setup?  My impression of
this firewall was that it was for the most part already configured after
you ran the setup.  Here is the link to the internet instructions for this.

https://www.engadget.com/2006/05/30/how-to-build-your-own-network-firewall/

The firewall runs from a CD rom and only uses a USB to store settings.
After my experience so far, I would say the instructions are not very
complete.

I am open to a different firewall option that would run on an older piece
of hardware since most of my hardware is not very up to date.

Thank you again!


On Mon, Mar 6, 2017 at 4:36 PM, David Champion <dchamp1337 at gmail.com> wrote:

> There are a few things you need to do, like turn on NAT. Here's one example
> of how to do that.
>
> http://www.revsys.com/writings/quicktips/nat.html
>
> There are several linux and bsd distros specifically designed to act as a
> firewall with a nice front-end on them. Some distros may also have a config
> option like "network connection sharing" that will do these things for you.
>
> You'll want to get familiar with iptables and / or shorewall if you're
> going to run your own linux firewall.
>
> -dc
>
> On Mon, Mar 6, 2017 at 4:24 PM, Tom Sellers <tsellers2009 at gmail.com>
> wrote:
>
> > I am trying to insert a firewall between my cable modem and my wireless
> > access point.  The firewall is just a computer running a linux variant.
> > (Devil
> >
> > I can ping the outside world from the firewall machine keyboard and
> resolve
> > pings such as "ping www.yahoo.com" fine. The problem is that none of the
> > machines connected to the wireless access point either by wire or
> wireless
> > have any address resolution or internet access.
> >
> > Right now I have the network attached to my existing network for testing.
> >
> > For example:    Existing home network ---- firewall machine --- new
> > wireless router --- 3 test machines (two wireless and 1 cabled)
> >
> > The firewall gets a DHCP address from my existing network as it would
> from
> > my cable provider.  The other side of the firewall is set up with a fixed
> > IP connected to one of the ports on the new wireless router
> (192.168.9.254)
> > (wireless router is 192.168.9.1).
> >
> > I am not that familiar with all the command line IP commands but can
> verify
> > the IPs of the various devices.  it seems to me there is a route missing
> > that prevents the internal IP from talking to the external IP of the
> > firewall.
> >
> > Anyone out there that can enlighten me as a somewhat inexperienced linux
> > user?
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