With Security at Risk, A Push to Patch the Web in today’s NY Times reminded me about OpenDNS, a free domain name system service. The article, which deals with a serious security flaw discovered in the operation of the domain name system earlier this year by Dan Kaminsky, an Internet security expert, notes that individuals and small businesses can protect themselves from the flaw by using OpenDNS. I configured my home network router for OpenDNS a few years ago and never thought about it again. The router failed six months ago and, reading this article this morning, I realized I never changed the default server settings on the new router to use OpenDNS. Making and implementing the changes took just a few minutes. The OpenDNS site provides simple instructions for configuring popular routers and changing DNS settings in Macs, PCs, and other devices. Take five minutes and do it.