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Earlier I used Windows 7 and the modem used to work absolutely fine. Even when it got disconnected it used to reconnect automatically without any trouble. But then I installed Ubuntu 11.10 on dual-boot and set up the modem connection properly but the modem now disconnects much more frequently (earlier it disconnected once in 5 hours or so and after Ubuntu in 5 minutes!).

Also once disconnected, it does not reconnect even when I have checked the "Connect Automatically" button. I have to restart the system to reconnect it. I the clean installed Windows and modem works perfectly fine again.

What is the reason for this and how can I solve this? I really want to use Ubuntu but due to this problem I can't.

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I don't know the answer, but it is not normal to disconnect every 5 minutes or every 5 hours. Are you connected directly to the modem, or to a router? If router, is it wireless or wired? These are all important facts that might help solve your problem. It's not normal for Ubuntu to do this. –  Marty Fried Oct 11 '12 at 3:08
    
Wired connection. connected directly to the modem. Also if it is normal then why it doesnt disconnect in windows 7 but does in ubuntu? Also in windows 7 i can redial automatically but why not in ubuntu? –  Misterious Oct 11 '12 at 3:35
    
can adding any ppa's or something like pppoe conf solve the problem? –  Misterious Oct 11 '12 at 3:38
    
From what you said, it doesn't seem that Windows works very well, either - just better. Are you using pppoe? I've never had to use that, just ppp. Never had to do any configuration at all, but I always use a router, and never connect directly to the modem. That way, the router isolates the PC so the default settings for every OS I've used work with defaults and no configuration. The router also acts as a firewall to isolate your network from the internet. –  Marty Fried Oct 11 '12 at 4:46
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