There is a tethered iphone connection to the Airport router in my home. In both connections setting’s the DNS shows as empty or blank. Recently I have shared the internet connection among airport ad-hoc connection and build-in-ethernet. After configuring this sharing I also modified several settings like turned off the Firewall and Turn on the websharing. My laptop is linked up to the d-link router. In theory if my internet distribution is configured properly I ought to be captivating the internet I’m receiving on my PC-to-PC ad-hoc network and sharing it above the router wirelessly. In Built-in-Ethernet TCIP settings also the DNS is empty. Now question is what is my DNS? Should it be empty? Why this DNS is for? How to properly share internet in excess of this wireless router?