I have already posted a nice simple tool called ZamZom for checking which wireless device is connected to your router or connection.Well that tool works pretty well but of you do not need to install any tool and you own a Belkin Router than I have figured out an easy way for checking which devices are using your wireless connection.
Well so today I was just configuring my router so I came through an option called DHCP Client List in Belkin Router under the Lan Setup tab. So what this thing does it simple shows you the devices connected to your network using their MAC Address.
So now this feature will let you know about the IP Address of that device, its Host Name if it has else the field will be blank and the MAC Address of that device. So now there is no need for any software just visit this link and press on refresh to see if someone stranger is connected to your network.
Now when you are done with it do check out some awesome tips for Improving your Wireless Network that will seriously help you out. Ok now make sure one thing that this guide is for Belkin I have not tested this DHCP thing in other routers maybe it wil present in some high end routers from Netgear or others but not sure for the default BSNL Router provided.