[Cialug] Firewall question

[David Champion]

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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