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I have 5 computers which are normally connected to an LAN, which is connected to internet access. However, rarely the internet provider has a fault and this causes the LAN to lose internet connection.

I also have 3G on my mobile, and can switch on the hotspot feature of Android smartphones, which would enable me to connect to the mobile Wi-Fi network and have internet. However, when I am connected to both LAN and WLAN, internet is lost again.

It seems internet access is trying to be diverted through the LAN. Is it possible to still have access to LAN (I need it to access server), while having internet via the wireless lan? (WLAN)

I am using Windows 7 64-bit.

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Have a look at changing the "metric" of the interfaces, showing in an answer here although I think you may run into issues wanting both connections at the same time. –  tombull89 Feb 20 '13 at 11:50
    
Won't post this as an answer since it's of little actual help. But I can simply say that I've been doing this succesfully on Win7 64-bit and recently Win8 64-bit for quite a while now. LAN to connect to work servers, but Internet access is restricted. WIFI to connect to internet. Both on at the same time.. I didn't need to take any particular steps. I think however the key bit is that Windows must be convinced that the LAN really has no Internet access. Only THEN will it consider other connections. –  Vincent Vancalbergh Mar 1 '13 at 9:11
    
Yes, my problem is that usually, the LAN does have internet. It seems to have solved itself if I temporarily set the gateway for the LAN connection to empty. –  Karl Cassar Mar 5 '13 at 14:53

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