Problems with iptables in 16.04 - was working in 14.04 (insmod)

[theprez]

Hello,

I thought I'd finally get more up to date and did a fresh install of 16.04 and am attempt to configure iptables - running the following command (which I need for openvpn purposes) generates an error:

iptables -t NAT -A POSTROUTING -s 10.8.0.0/24 -o en01 -j MASQUERADE
iptables v1.6.0: can't initialize iptables table `NAT': Table does not exist (do you need to insmod?)


I'm a little unclear on why this isn't working or what insmod is (doesn't appear to be a program that can be installed thru apt get)

Any ideas?

Thanks