I want to stop employes of using social media and other sites i might think i dont want them to visit, yet there are some times we need to use it so i need some flexible customizable solution.
I tried router and it only blocks up to 8 sites. I can use a DNS filtering solution e.g. OpenDNS.com yet how can i stop users from just changing their dns manually to (e.g. google dns 220.127.116.11 and 18.104.22.168) to avoid my block?
I can setup machine with proxy server and make it a gateway, yet I still face same issue with proxy they can just remove proxy settings in browser and use direct connection.
Is there some way to block all connections other than to custom dns or proxy server that I can setup somewhere at router or gateway? I have a use Netopia 3700, but I might be able to buy a new one.