Problem finally solved. here is how .
*First Go to
router page(
http://192.168.1.1).
*Login with username=admin & password=admin.
*Select Advance settings >>> Wan
*Delete all but 0/35.
*Select edit on 0/35 and Click next
*Select PPPoE and Click Next
*Enter username and pwd that you use to connect as PPP username and pwd
*Click Next
*Enable NAT, IGMP, Firewall, WAN
*NOW Save and reboot
*Now close and reopen your and browser login at router page
*Select Advance settings >>> Lan
*Now enable DCHP and enter IP Address: 192.168.1.2 to 192.168.1.20(as many you need) and Subnet
Mask:255.255.252.0
*Now Save
*Select Wireless>>>Security
*Enable WEP Encryption with Encryption strength as 128
*Select network key and enter enter a 13 char network key(wifi password)
*NOW Save and reboot
Turn off and restart your router