Aaaaaaaaahhhhh... It appears that nat is *not* handled by iptable_nat as one would expect, or at least not *only* by that one. The missing module is iptable_mangle and the nice Redhat firewall script that I have been using, doesn't load that one, saying that it is an unneeded kernel module - sigh. Once I loaded that with: iptables -F -t mangle and added my rules again, they now show up in the nat list, although it still doesn't friggen work. I think it is time to reboot the whole machine and start over, but I thought I'll send this message first. Wheee, at least now I'm getting somewhere and in another day or so I can stop banging my head on the table - maybe. Cheers, -- Herman Oosthuysen B.Eng(E), MIEEE Aerospace Software Ltd. Ph: 1.403.241-8773, Cell: 1.403.852-5545, Fx: 1.403.241-8841 Herman@xxxxxxxxxxxxxxxxxxxxx, http://www.AerospaceSoftware.com