Sharing Internet With Windows XP - Firewall Off Only (How to unblock UDP)

Hi
I can share my Mac connection with my windows PC but only if the firewall is off.
On the Tiger forums it says go onto services and click the advanced tab and unblock UDP traffic - and then firewall can be turned on.
This option doesn't seem to be available in Panther - so until I upgrade can anyone tell me how I unblock UDP traffic in Panther?
Thanks

Hello albertoPeralta. Welcome to the Apple Discussions!
To open ports on the Time Capsule, you would use the AirPort Utility to configure Port Mapping.
AEBSn - Port Mapping Setup
To setup port mapping on an 802.11n AirPort Extreme Base Station (AEBSn), either connect to the AEBSn's wireless network or temporarily connect directly, using an Ethernet cable, to one of the LAN port of the AEBSn, and then use the AirPort Utility, in Manual Setup, to make these settings:
1. Reserve a DHCP-provided IP address for the Shakespeer host device.
Internet > DHCP tab
o On the DHCP tab, click the "+" (Add) button to enter DHCP Reservations.
o Description: <enter the desired description of the host device>
o Reserve address by: MAC Address
o Click Continue.
o MAC Address: <enter the MAC (what Apple calls Ethernet ID if you are using wired or AirPort ID if wireless) hardware address of the host computer>
o IPv4 Address: <enter the desired IP address>
o Click Done.
2. Setup Port Mapping on the AEBSn.
Advanced > Port Mapping tab
o Click the "+" (Add) button
o Public UDP Port(s): 4000
o Private IP Address: <enter the IP address of the host server>
o Private UDP Port(s): 4000
o Click "Continue"

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