Networking :: Installing a firewall on RC2 remastered

Hi,

I am remastering RC2.

Now, I have to install a firewall. I installed Shorewall (from Debian stable repository), and I made it charge during the boot:

# apt-get install shorewall
# update-rc.d shorewall defaults

But Shorewall can't load, giving the following error:

modprobe: modprobe: Can't locate module ipt_policy
modprobe: modprobe: Can't locate module ipt_physdev
modprobe: modprobe: Can't locate module ipt_iprange

I only need to open the port 27015:UDP and close all other, but I only know how to use Shorewall, I don't know use Iptables.

Do you know how can I charge these modules at startup?
Do you have any other idea?

Thank you!

original here.