[other] Adding NIC on VirtualBox

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http://ubuntuforums.org – Hi All, Good Day! i just want to ask,anybody here familiar with virtualbox. i trying to add another eth on my ubuntu 12.04 machine. i install vbox on windows7. i already have two nic eth0 and eth1 connect using bridged adapter. when i try to add another new nic using NAT adapter, i cannot connect to internet.(i add this eth2 while the machine running). when i do ifconfig, the eth2 get the ip address release by dhcp server. i have another ubuntu machine running using NAT(have 1 nic only) and can go to internet. p/s: sorry if this not the right place to ask. Thanks. (Hardware)