Appletalk-IP driver support

modulename: ipddp.ko

configname: CONFIG_IPDDP

Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>Appletalk-IP driver support
In linux kernel since version 2.6.12  
This allows IP networking for users who only have AppleTalk
networking available. This feature is experimental. With this
driver, you can encapsulate IP inside AppleTalk (e.g. if your Linux
box is stuck on an AppleTalk only network) or decapsulate (e.g. if
you want your Linux box to act as an Internet gateway for a zoo of
AppleTalk connected Macs). Please see the file
<file:Documentation/networking/ipddp.rst> for more information.

If you say Y here, the AppleTalk-IP support will be compiled into
the kernel. In this case, you can either use encapsulation or
decapsulation, but not both. With the following two questions, you
decide which one you want.

To compile the AppleTalk-IP support as a module, choose M here: the
module will be called ipddp.
In this case, you will be able to use both encapsulation and
decapsulation simultaneously, by loading two copies of the module
and specifying different values for the module option ipddp_mode.

source code: