I have Dell Studio 14 with i5 processor with window 7 OS, realtek network adapters Whenever i tried to connect to internet(Airtel Broadband) through ethernet cable. It shows unidentified network no internet access, but when i use wireless connection it established. I have done all the following things... 1.. i use ipconfig /all i found that no address for default gateway & my subnet mask 255.255.0.0. After that i manully set the ip address, subnet mask & default gatway like this... ip address : 192.168.24.8subnet mask : 255.255.255.0default gateway : 192.168.1.1dns server : 192.168.1.2alternate dns server : 220.127.116.11 This all are under IPv4.. after that i again use ipconfig /all all settings are displayed which i have changed. but the problem still persisted. After that i use netsh winsock reset catalog & it prompted to restart & i did restart the computer.. Again ipconfig /all & same details appear with all changes i have done manually but problem not resolved. After that i also turnoff the firewall uninstalled the antiviruse & restart. but again same problem "no internet access".. i also use the ipconfig /release.. but an error is occured loopback Pseudo-interface 1 - the system cant find the file specified"... I have checked the BIOS also for NIC which is enabled I have again reinstalled the all driver for my dell laptop & problem still there. & there is No Bounjour installed ...Whatever it is ... When i troubleshoot the problem through Window 7 method it show (i don't know the exact but it is something like this) "Invalid IP address for Lan configuration." What do i do now..???? Please give me a solution.