DNS and IP conflict errors

Hello experts,
When I want to browse in the internet, the net connection just stopped after a few minutes.
It states I am linked to my Wi-Fi network; however there is "limited or no connectivity."
When the error occurs, the entire thing on the network just loses the connection at the similar time.
In my home, i have one PC, one iPod touch, one Mac, as well as 2 iPhones and all are connected to the wifi.
I need to find the reason and a solution. Please help me.
Thanks in advance.
Error: DNS and IP conflict errors.

