I got 256 Infinity plan and was given Billion ADSL Router.....I want to share connection with another computer and also want to use WiFi with my Laptop....

I tried using BSNL Dataone router and was able to connect successfully with one computer....
When one pc is configured with ip 192.168.1.10 -> i can connect successfully
When i configure another pc connected with the router -> i cannot connect.
I cannot share internet simultaneously on more than one pc.....
Also i tweaked alot and found out that the pc with the ip configured as 192.168.1.10 was able to connect successfully....others failed....and when i change ip of pc (which wasnt able to connect before) to 192.168.1.10 --> Then it works successfully.............

Any idea whats the problem ? if anyone has set-up this kind of network please help.............Any kind of help would be appreciated........