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I have a model B pi connected to an old router upstairs through ethernet cable. When I connect to this router with my laptop I can SSH and VNC to the pi no problem. When I then connect the pi to another network over WiFi using my usb adapter, the ethernet connection drops thus killing my VNC and SSH connections.

I am using Raspbian Wheezy and connecting with the basic WiFi tool from the desktop. I thought this would be something fairly easy to setup but I'm not really sure what to do next.

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    don't your networks share same address space? – lenik Jun 12 '13 at 6:08
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    Please dont thank in the question. Use upvote to thank. I think you have a power supply issue. Once the Wifi start to connect it causes a brown out and cuts out the ethernet. You can have as many network connections as you like/need. You just more power "Scotty"! – Piotr Kula Jun 12 '13 at 7:33
  • It seems it must be a power issue, have tried booting and letting wifi connect and then plugging ethernet in. Both connect and the connections last for about a minute or 2 but then wifi drops and wpa_supplicant fails to see the device anymore. I then have to bring the IF up again but that then drops the ethernet once more. I have ordered a powered hub so will see if that makes any difference. – Sam Jun 13 '13 at 20:47
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It looks as if you are not supplying enough power to the WiFi device. You need to either get a device that consumes less power, or use a powered USB hub instead.

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