Does Web Gateway support Authentication by IP address?
Our LA are about to go over to Web Gateway and our current product supports authentication via IP range, i.e. ranges 172.21.1 - 100 can get content a,b,c+d where as 172.21.101-200 get all content. This without the need of the end user entering a username and password to authenticate.
You can use the Client.IP property to restrict or allow access according to your requirements.