Столкнулся с такой вот проблемой: есть ядро 2.6.28 и iptables 1.4.6,
нужно сделать NAT.

# uname -r
2.6.28-gentoo-r5

# iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
FATAL: Module ip_tables not found.
iptables v1.4.6: can't initialize iptables table `nat': Table does not
exist (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.