How many users are we talking about? I've heard that Vigor makes solid devices, but you might be putting too much demand on the poor thing. Sounds like you have two of them now, so maybe have both of them running but each one serving different purposes? You can use Wireshark to examine what is going on with your traffic. I've never used Vigor, but you should be able to use a web browser or Vigor software to interface with the device and configure the settings you mentioned.