Ubuntu Networking :: Intel 4965 And Wifi To Ethernet Bridging?

I have been trying to get my laptop to share its wireless connection to my older, wireless-less, computers through its ethernet port. So far, I have not been able to make it work. As far as I know, what I am trying to do is called network bridging. The method I have been trying so far is to run these commands as root:

Code:
ifconfig wlan0 -promisc
brctl addbr br0
brctl addif br0 wlan0
brctl addif br0 eth0
ifconfig br0 up

Each time I do this, the system running as a bridge loses connection, and the system being bridged to never gets a connection. My hardware is:

Code:
08:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 02)02:00.0 Network controller: Intel Corporation PRO/Wireless 4965 AG or AGN [Kedron] Network Connection (rev 61)