More than one NICs for Linux guest?

[delaflota]

Hi,

I have installed VirtualBox 4.3.10 on Windows 7 (64Bit) and as guest machine a BackTrack5R1_64 (as Linux 2.6 - 64 Bit).

When I wanted to configure the network I realized that the adapters 2 to 4 are all greyed out.

How can I use more than one Network Adapter?

My Host has only one physical network adapter.

Thanks

[Perryg]

You can not add or remove network adapters as long as the guest is running. It must be completely shut down.

[delaflota]

@Perryg,

Thanks very much for your Answer.
I've installed it again from scratch and then it was possible to define a second device..
I don't know what it was...