OpenBFDD is an open source package that provides a software based
implantation of the Bidirectional Forwarding Detection (BFD)
protocol. It is designed to run on a server. Its primary purpose
is to allow the administrator to quickly take the server off-line
when the core service, such as a bind or unbound server, goes down.
This is done by providing a BFD "beacon", bfdd-beacon, that can
communicate with a properly configured, BFD enabled, router. A
control utility, bfdd-control, can be used to configure the running
bfdd-beacon daemon, and to change the state of its BFD sessions.

Homepage:
https://github.com/dyninc/OpenBFDD/
