Using NAT as a "block" system

[danesco]

I need to block and redirect certain users with nat.
Thats because i can not install squid and use wan balance at same time.

What works:

if i create a rule like in the first attach, works, if i try to websurf the nat redirectme to the internal server in the port 8080.

What is not working:

The problem is that the host in the alias need to put data in a only webpage in the www, so, i put this second rule (erasing the last):

in this rule i put a not rule for the des. address so in theory if the host does not websurf to that address its redirected to internal server, but this rule does not work.

Edit: Im using 2.0rc nanobsd in alix board of 17/03/11