I have an office file/webserver running on ubuntu server. I have a small company employee info site. Is there an easy way to set up a captive portal for internal/intranet traffic to go to that portal first and then be sent to the internet? I don't require authentication, although if I had it, it would have to check against a pop3 server as this current setup does not use AD (which I will change soon). I also have clearOS and a centOS server but I can not use the centOS since its a centralized syslog server. I can make another centOS if needed.