Router/Firewall?

[Aperez]

Hi:

I am trying to set up a router/firewall with Freebsd 5.3 this is my 
information:

Winxp and Freebsd machine connected to Firewall machine using a hub

Firewall has two ethernet cards:  card1: dc0 connected to cable internet 
using DHCP
                                                 card 2: rl0 setup to 
use 192.168.1.1

I can connect to the internet from the firewall: ping -c 3 www.yahoo.con 
successfull
I can ping from Firewall to the other two machines (WinXP and FreeBSD)
I can ping from XP to FreeBsd and Firewall
I can pin from FreeBSD to XP and Firewall

Here is the problem: I cant connect to internet from neither XP nor 
FreeBSD machine

Here is my rc.conf from the firewall machine:

gateway_enable="YES"
ifconfig_lo0="inet 127.0.0.1"
ifconfig_dc0="DHCP"
ifconfig_rl0="inet 192.168.1.1 netmask 255.255.255.0"
ipfilter_enable="YES"
ipmon_enable="YES"
ipmon_flags="-Dsvn"
ipnat_enable="YES"
ipfs_enable="YES"

Can anyabody tell me what I am missing?