This package contains the patches for the Linux kernel to get the necessary kernel support to use Openswan. If you want to build a kernel module for IPSec, it is much easier to use the openswan-modules-source package instead. This kernel-patch package should probably only be used when building a non-modular kernel or when compiling IPSec non-modular. . It includes the NAT Traversal patches and applies them automatically to the kernel after inserting KLIPS.