Problem: I have one main location and about 5 remote sites. The remote sites use the DNS at the main location but have their own internet connection. I would like to implement something at the main location that blocks a slew of web sites based on different categories.
The only option I can think of is using openDNS but I think the cost might be a little high.
Is there anything that I can implement that would either be free, a one time charge, or lower cost then openDNS?
I do have a ASA5505 at each remote site, not sure if that could be used.