Problem with NAT (no replies)

Hey!

Thanks for all your support. I have a little Problem with activating NAT.

I am using Kernel: 3.8.11-kirkwood-tld-3

iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o eth0 -j MASQUERADE

Result:

iptables v1.4.14: can't initialize iptables table `nat': Table does not exist (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.

Anyone some suggestions to solve the Problem?

Thank you very much!