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I have a computer with a USB-to-WiFi adapter and and Ethernet port.

When I connect the PC to the wireless network I receive an IP and I'm able to ping it. However when I connect the Ethernet cable as well I'm not able to ping the IP of the wireless adapter any more.

What could be the problem?

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both wireless and wired network is in same subnet with same gateway? – Kaveh Mar 7 '13 at 17:16
@Kaveh yes they are – Maverik Mar 7 '13 at 17:25
IS it right? after plugged in Ethernet cable, you cannot ping your own USB wifi? – Kaveh Mar 7 '13 at 19:24
@Kaveh I can ping the IP of the wifi adapter untill I plug in the ethernet cable. – Maverik Mar 7 '13 at 19:51

2 Answers 2

You can have an IP conflict since both ports are on the same segment. Then, you need to define what interface you use, using the "route" command.

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I suppose that you use Windows. Probably the firewall doesn't allow ping. Try to disable the firewall to check it.

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