CentOS - Sep 2011 - is there a way to make the kernel see a new ethernet device without rebooting?

I have a VMWare ESX server with virtual machines running CentOS.  I want to add
an ethernet interface to one of the CentOS virtual machines.  VMWare allowed me
to add a virtual NIC to the CentOS virtual machine while it was running. 
However, the CentOS o.s. cannot see the new NIC.  Is there a command I can run
to make the kernel aware of the new ethernet device?  I don't want to reboot
the CentOS o.s. if I don't have to

Thanks,

JD

On Tue, 27 Sep 2011, Jon Detert wrote:
> I have a VMWare ESX server with virtual machines running CentOS.  I want to
> add an ethernet interface to one of the CentOS virtual machines.  VMWare
> allowed me to add a virtual NIC to the CentOS virtual machine while it was
> running.  However, the CentOS o.s. cannot see the new NIC.  Is there a
> command I can run to make the kernel aware of the new ethernet device?  I
> don't want to reboot the CentOS o.s. if I don't have to
Adding a NIC to VMWare with a CentOS 6 guest (e1000) works just fine here.  I
don't remember there being any problems with CentOS 5.

Does dmesg show evidence of the new device being attached?

jh