--- /dev/null
+config BR2_PACKAGE_KNOCK
+ bool "knock"
+ select BR2_PACKAGE_LIBPCAP
+ depends on BR2_USE_MMU # fork()
+ help
+ A port knocking implementation.
+ Provides a daemon and a user application. Port knocking can be
+ used to run an arbitrary application, once the daemon detects
+ a predefined sequence of incoming TCP/UDP packets on a network
+ interface. This can be used, e.g. to open up ports in a
+ firewall.
+
+ http://www.zeroflux.org/projects/knock