You also need: 
pseudo-device   ipfilter                # IP filter (firewall) and NAT

in the kernel config and recompile (if it wasn't there).

Make sure you have the right /dev/ entries as well, something like (On
i386):

crw-------  1 root  wheel  44, 1 Mar 23  2000 /dev/ipnat

..and if not use /dev/MAKEDEV to create them.

sh /dev/MAKEDEV ipl

Lund

-- 
Jorgen "Lord" Lundman <lundman@lundman.net>
Technology Manager, Unix Administrator
Phone: +44 (020)8659-1860  Mobile: (07958)642-918
Pager: 07958642918@one2one.net
"Rare is the person who can weigh the faults of others 
 without putting his thumb on the scales": Byron J. Langenfeld