I am having a similar problem on a Dell Latitude E6410. It connects to the Internet just fine at our regional office and at home, but at a field office it cannot obtain a DHCP address. I've run all the ipconfig /.... resets to no avail. Other dell models, Precision Mobile notebooks and Optiplex desktops work fineat that location, but it seems all E6410s received after Nov 2010 have the same problem. Dell has replaced the mother board twice but I suspect the replacements are from the same mother board supplier as the problem motherboard. All use the Intel 82577LM gigabit network card (on motherboard). Tried driver from Intel dated 2/24/2011, older drivers, no help. System is using windows xp sp3. Any one else experiencing this issue?