config BR2_PACKAGE_KNOCK bool "knock" depends on BR2_USE_MMU # fork() select BR2_PACKAGE_LIBPCAP 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