How can I limit my kid's internet exposure?

Episode 1030 (1:11:24)

Max from Palos Verdes, CA

Max has teenage girls and they live on the Internet. What can he do to limit their use? Leo says that most routers can limit time. Apple's Airport can limit time and even restrict specific computers (look in the advanced settings and filter by MAC address). He should also lock down his router with password protection. He can also use OpenDNS to limit where they can go.