This has nothing to do with search engine marketing, but everything to do with automation. If you’ve ever wanted to host a server at a location that doesn’t have a static IP address then you know just how much of a pain it can be.
Hopefully by the time you read this you’re familiar with what DNS is and what dynamic DNS is. If not, those links should catch you up to speed quick enough. I’ve tried a few different dynamic DNS providers but for the past few years I’ve been using freedns.afraid.org. I don’t host this site (of course), but I do host FTP and a few other services that allow me to get to my machines at home where ever I am.