An apparent regression from earlier fedoras, rawhide says: # iptables -t nat -L 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. % rpm -q kernel-PAE iptables kernel-PAE-3.3.1-3.fc17.i686 kernel-PAE-3.3.1-5.fc17.i686 kernel-PAE-3.7.0-0.rc0.git3.1.fc19.i686 iptables-1.4.14-3.fc18.i686 % man iptables | grep " nat " [... still shows old documentation ...]
This is a kernel problem: IPv4 NAT is not enabled. Please also enable IPv6 nat. Reassigning to kernel.
This has been fixed in git and will make tomorrow's rawhide build