Tom is having issues with Google's DNS server not responding. DNS is the phone book for the internet. It takes the URL and converts it to the unique IP address for that website. It will look in local memory first, then the router, and then the Internet Service Provider for the address. It can even go beyond that to the master servers that house all domain names and DNS lookups. If it can't find it, you get an error message that there's a kink in the chain. That could mean there's something broken on your PC, or even your ISP's servers.
Rick wants to know how domain names and DNS settings work and why sometimes it takes awhile to get his DNS listed. Leo says that DNS, which stands for Domain Name Servers, is basically the phone book of the internet. Not all DNS are alike, though. OpenDNS is pretty good. But chances are his ISP's DNS will be the fastest.
Garth is having trouble on his browser accessing the internet. It's very slow. Leo says that if he's tried different browsers and different websites, then it sounds like the DNS configuration with his router is screwed up. He can use a third party DNS like OpenDNS, which is free and easy to set up.
Don wants to be able to cut off access to the internet with a touch of a button. Leo says that some routers allow him to do this by MAC address (called an "access control list"). They can set the internet to go off at certain times. He can also go to OpenDNS.com and use their DNS system to filter out unwanted websites. This will work for smartphones as well.
Victor wants to know about IP version 6. The way IP version 6 works is like the current system of numbers, but instead of a dotted "quad", which is four 8 bit digits surrounded by dots, they've added two more to make it a dotted "sextet." This allows for a large amount of IP addresses.
Leo says that the domain name server (DNS) is basically the phone book for the internet. When you type in an address, the DNS then takes that address and looks up the actual IP address of the website. It's numbers separated by periods. Tom can change his DNS on his computer quite easily. On the Mac, it's in the network settings of OS X.
Aaron is having an issue where all of his computers get redirected to "CloudFlair.com" when he tries to access Google. Leo says that Aaron's ISP is doing that. It's a service that specializes in protecting people against attacks. Could he change to OpenDNS? Leo says sure, but he may end up getting a different, but similar message. This is something browsers do with expired or mismatched certificates. Leo says that Aaron should try using Google's DNS, which is 18.104.22.168.
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.
Jay wants a router that can access the fastest DNS on the net. Leo says that would be a great feature. Steve Gibson has a program that can find them, but Leo doesn't know of any routers that have that built in.
Jeffrey has been on a dating website and now he's having trouble connecting to the internet. He has been getting notified that his cookies were disabled. Leo says it's DNS malware that has redirected traffic through the DNS servers to control what he sees. It could have impacted his computer, or his network's router. Since Jeffrey has only seen it on his computer, that's an easier thing to repair. He should backup his data, and then format his hard drive and reinstall his OS from a known, good source.