scenario because I use a lot of programs for testing and do not wish to manually forward ports every time. In this scenario everything works fine and TP-Link router is a very cheap one 15$. In this scenario there is TP-Link router between my PC and ISP router/switch installed in my apartment. After a while I get back my connection but then I lose it again sometimes forever and I have to restart my computer. If I try to download torrent with a lot of peers (35<, not including web seeds) it works for a while but then I lose internet connection (it says limited connectivity) and Windows 7 tells me that PC is connected to router (main router in city block not the one ISP installed in my apartment) but it does not have internet connectivity. If I download torrent with little peers (<20) it is working normally. In this scenario my PC is directly connected to a router/switch provided by ISP, I can use two ports because I have assigned two IP addresses. My internet connection is working fine when I am downloading files through FTP, HTTP in both scenarios.

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