Dummy net driver support

modulename: dummy.ko

configname: CONFIG_DUMMY

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Dummy net driver support
In linux kernel since version 2.6.12  
This is essentially a bit-bucket device (i.e. traffic you send to
this device is consigned into oblivion) with a configurable IP
address. It is most commonly used in order to make your currently
inactive SLIP address seem like a real address for local programs.
If you use SLIP or PPP, you might want to say Y here. It won't
enlarge your kernel. What a deal. Read about it in the Network
Administrator's Guide, available from
<http://www.tldp.org/docs.html#guide>.

To compile this driver as a module, choose M here: the module
will be called dummy.

source code: