My laptop uses wifi, and Pi is connected to router via cable. With the dynamic IP, it worked well with Putty on my windows 7.
Then trouble came after I changed the /etc/network/interfaces on putty to obtain a static IP. Now I cannot "talk" to my Pi, because every time I start a new session on putty with the new static IP, trying to log in my Pi, putty tells me the error: connection timed out.
Now I even cannot find the dynamic IP on my routers webpage...what can I do to get everything go back to the beginning... I miss dynamic IP. Any one could help?