[Cialug] Firewall question

[Tom Sellers]

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?