I just installed a fresh copy of Ubuntu 12.04 along with windows xp as dual boot on my desktop. My internet requires web based login i.e. my isp displays a page where I have to login with login credentials using the info provided by ISP to use internet. My internet stops working randomly on Ubuntu but works perfectly without any problems when using windows xp. On ubuntu, the connection drops suddenly and starts working after 5-10mins automatically. The problem occurs while m using the internet or updates are downloading or anytime suddenly in between. Its really annoying. Its a wired ethernet connection and I have set IPv6 to ignore and IPv4 to DHCP automatic. Please help me resolve this problem.