setting up nocatauth on a linux bridge

hi to all :)

I'm trying a setup of nocatauth on a linux bridge: people from one side of 
the bridge has to be authenticated to get to the other side (and 
eventually to the internet :) ).
I have read previous thread on the list about this so I have assigned an 
ip to the bridge interface because i need to connect 
remotely to the machine, and I set the option RouteOnly to 1 in 
nocat.conf and Internal and External Interface to the bridge one.
I modified also the gateway script, decommenting the line for routing 
instead of natting (which i commented out).
I setup an authserver too in the bridge (don't beat me! :) ) and i got 
through the authentication process having a javascript pop-up open, but 
strangely no connection to the outside.

any suggestions?

I think I have to modify further the gateway script: any clues? :)

or maybe can be something in the authserv setup?

Many thanks in advance