iptables rerouting 1

[disturbedone]

I am new to iptables and have what, I hope, is a relatively simple request.

* Ubuntu 11.04 (just built, no other config done)
* Virtual Machine
* Single NIC 10.100.0.9/16
* Anything coming in on port 80 to redirect to 10.11.0.19/16

What commands are required to achieve that? I've seen various forums with similar queries and I've tried something but haven't got it to work exactly.

Then, where are config files stored in Ubuntu? I've seen various forums pointing to /etc/sysconfig/ but there's no such folder in Ubuntu.

Thx

 

[disturbedone]

Ok, I worked out these commands get this to work.

sudo sh -c "echo 1 > /proc/sys/net/ipv4/ip_forward"
sudo iptables -t nat -A PREROUTING -p tcp --dport 80 -j DNAT --to-destination 10.11.0.19:8080
sudo iptables -t nat -A POSTROUTING -j MASQUERADE

The problem now is getting them to work on reboot. I've tried this

https://help.ubuntu.com/community/IptablesHowTo#Saving iptables

but it doesn't seem to stick. Even the first command that enables forwarding at all doesn't stick. Any ideas?