How do i disable networking support in the kernel?

[linux]

I am running RTLinux Pro on top of FC6.  The RTCore networking module 
requires that "for any device you wish to use [with the networking 
module], you must make sure that Linux is not using that device.  You 
can do this by disabling support for that device in the Linux kernel 
configuration, installing that kernel and rebooting".

How do i disable networking support in the kernel?

Ed