How to enable ICMP requests

I have all the connectivity working between my external and internal networks - yay! Except ping. So I can live without it, but it aggravates me. How is this configured?

As a test, I ran:
sudo iptables -A INPUT -p icmp -j ACCEPT

Now ping works. But where do I place the configuration to allow ping at boot up?

Ubuntu forums suggest it is ufw. I checked /etc/ufw/ufw.conf:

Code:

# /etc/ufw/ufw.conf
#

# set to yes to start on boot
ENABLED=no

So I'm not even sure its running. Even so, the /etc/ufw/before.rules file contains the correct iptable rule so far as I can tell:

Code:

# ok icmp codes
-A ufw-before-input -p icmp --icmp-type destination-unreachable -j ACCEPT
-A ufw-before-input -p icmp --icmp-type source-quench -j ACCEPT
-A ufw-before-input -p icmp --icmp-type time-exceeded -j ACCEPT
-A ufw-before-input -p icmp --icmp-type parameter-problem -j ACCEPT
-A ufw-before-input -p icmp --icmp-type echo-request -j ACCEPT