VOIP Tech Chat → [Equipment] Draytek 2850n NAT>DMZ > True IP not working on ubunt

I configured NAT ->DMZ -> True IP to point to my eth0 mac address on my ubuntu 12.10 box.

I disabled all firewalls on the 2850n, but I still can't reach my web server on ubuntu 12.10
on port 80.

ufw disable
shorewall stop
shorewall6 stop
iptables -L -n
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X
iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT

By the way, I had the Draytek guys confirm it works on an old winxp laptop last night. The only setting I changed was the MAC ADDRESS from the winxp laptop to my Linux box.

Does anyone have any suggestions?

Thank you.