Freebsd 5.1 <-> Win XP Networking problems

[freebsder]

I have a Freebsd 5.1 box connected to the internet. 
It works.  But I am now trying to network two other
Win XP machines as per the following network
hierarchy:

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Setup
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ISP-> DSL Modem -> FreeBSD box :
1) "vr0" 192.168.0.1 [Gateway machine address] 
2) "ed0" 192.168.0.3 [Internal Network address]
connects to:->

4- port HUB ->
1)WinXP machine #1 192.168.0.2
2)Freebsd Box 192.168.0.3
3)WinXP machine #2 192.168.0.4

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Problem:
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I cannot communicate to the Internet from WinXP #2 
(Have not tried to config WinXP #1 yet).

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Browser Config
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IE Brower Settings for WinXP #2 {Tools>Internet
Options>Connections>)
-I set the browser so that it never dials a connection
because it is suppose to be networked right?
- in the LAN Settings option, I set the Proxyserver
option with the address of the gateway of 192.168.0.1
with Port 80

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Dialouge
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>From Freebsd Machine
# ping 192.168.0.4
PING 192.168.0.4 (192.168.0.4): 56 data bytes
ping: sendto: Host is down
ping: sendto: Host is down

-at one point I was able to ping the freebsd machine
from WinXP #2 but then for some reason, I made a
change and cannot ping anymore...

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RC.CONF
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My rc.conf file looks like this:
	font8x14="NO"
	font8x16="swiss-8x16"
	font8x8="swiss-8x8"
	inetd_enable="YES"
	linux_enable="YES"
	moused_enable="YES"
	moused_port="/dev/psm0"
	moused_type="auto"
	nfs_client_enable="YES"
	nfs_server_enable="YES"
	rpcbind_enable="YES"
	saver="rain"
	scrnmap="NO"
	usbd_enable="YES"
	ifconfig_vr0="DHCP"
	ifconfig_ed0="DHCP"

##initialise NIC
	network_interfaces="vr0 ed0 lo0 tun0"
	ifconfig tun0
	ifconfig vr0= "media 10baseT/UTP up"
	ifconfig_ed0="inet 192.168.0.3  netmask 255.255.0.0"
	ifconfig_vr0="inet 192.168.0.1  netmask 255.255.0.0"
	hostname="myserver"

##User ppp configuration
	ppp_enable="YES"
	ppp_mode="ddial"
	ppp_nat="NO"
	ppp_profile="bellnet"
	#ppp_user="root"

## Firewall
	gateway_enable="YES"
	firewall_enable="YES"
	firewall_type="OPEN"
	#firewall_quiet="NO"
	firewall_script="/etc/rc/firewall"

	natd_enable="YES"
	natd_interface="vr0"
	natd_flags="redirect_port tcp 192.168.0.3:80 80"

	rpc_statd_enable="YES"
	tcp_extensions="YES"

## Mail

	sendmail_enable="YES"

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HELP!

Thanks in advance.



		
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