ipmasq problems

[wax_man@bellsouth.net]

Ok, I've gotten my network up, but I can't seem to get ipmasq to work. 
I've followed the mini-howto and added the appropriate lines to my
/etc/init.d/network file.  However, everytime it tries to run ipfwadm
it croaks.  Here are the commands, and the errors:

ipfwadm -F -p deny 
  ipfwadm: setsockopt failed: Invalid argument

ipfwadm -F -a m -S 192.168.1.0/24 -D 0.0.0.0/0
  ipfwadm: setsockopt failed: No such file or directory


I'm running 2.1.131 on a mixed hamm/slink/potatoe system.  

TIA,

Chris