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-@node Kernel Interface
-@chapter Kernel Interface
-
-There are several different methods for reading kernel routing table
-information, updating kernel routing tables, and for looking up
-interfaces.
-
-@table @samp
-
-@item ioctl
-The @samp{ioctl} method is a very traditional way for reading or writing
-kernel information.  @samp{ioctl} can be used for looking up interfaces
-and for modifying interface addresses, flags, mtu settings and other
-types of information.  Also, @samp{ioctl} can insert and delete kernel
-routing table entries.  It will soon be available on almost any platform
-which zebra supports, but it is a little bit ugly thus far, so if a
-better method is supported by the kernel, zebra will use that.
-
-@item sysctl
-@samp{sysctl} can lookup kernel information using MIB (Management
-Information Base) syntax.  Normally, it only provides a way of getting
-information from the kernel.  So one would usually want to change kernel
-information using another method such as @samp{ioctl}.
-
-@item proc filesystem
-@samp{proc filesystem} provides an easy way of getting kernel
-information.
-
-@item routing socket
-
-@item netlink
-On recent Linux kernels (2.0.x and 2.2.x), there is a kernel/user
-communication support called @code{netlink}.  It makes asynchronous
-communication between kernel and Frr possible, similar to a routing
-socket on BSD systems.
-
-Before you use this feature, be sure to select (in kernel configuration) 
-the kernel/netlink support option 'Kernel/User network link driver' and 
-'Routing messages'.
-
-Today, the /dev/route special device file is obsolete.  Netlink
-communication is done by reading/writing over netlink socket.
-
-After the kernel configuration, please reconfigure and rebuild Frr.
-You can use netlink as a dynamic routing update channel between Frr
-and the kernel.
-@end table