You may find that you are in breach of your agreement with the council as ISP if you do this. Unless you are very careful about how you set things up - which you probably will be because you are on this list :) - you could easily provide an simple route through your ISDN for an attacker to access the entire LEA network. I believe that some schools in Leeds (where the LEA provided access is limited like yours) have been stamped on for this. Your setup as you describe it seems terribly wasteful of bandwidth into the school. Surely a much better arrangement would be to have all your internal network machines pointing to a proxy server in school and this should be the only machine with routing to the LEA network. Cheers -- Phil Driscoll