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+config BR2_COMPILE_KNOCK
+ tristate
+ default n
+ depends BR2_PACKAGE_KNOCK || BR2_PACKAGE_KNOCKD
+
+config BR2_PACKAGE_KNOCK
+ prompt "knock............................. A port-knocking client"
+ tristate
+ default m if CONFIG_DEVEL
+ select BR2_COMPILE_KNOCK
+ help
+ It listens to all traffic on an ethernet (or PPP) interface,
+ looking for special "knock" sequences of port-hits. A client
+ makes these port-hits by sending a TCP (or UDP) packet to a
+ port on the server. This port need not be open -- since
+ knockd listens at the link-layer level, it sees all traffic
+ even if it's destined for a closed port. When the server
+ detects a specific sequence of port-hits, it runs a command
+ defined in its configuration file. This can be used to open
+ up holes in a firewall for quick access.
+
+ http://www.zeroflux.org/cgi-bin/cvstrac/knock/wiki
+
+config BR2_PACKAGE_KNOCKD
+ prompt "knockd............................ A port-knocking server"
+ tristate
+ default m if CONFIG_DEVEL
+ select BR2_COMPILE_KNOCK
+ help
+ It listens to all traffic on an ethernet (or PPP) interface,
+ looking for special "knock" sequences of port-hits. A client
+ makes these port-hits by sending a TCP (or UDP) packet to a
+ port on the server. This port need not be open -- since
+ knockd listens at the link-layer level, it sees all traffic
+ even if it's destined for a closed port. When the server
+ detects a specific sequence of port-hits, it runs a command
+ defined in its configuration file. This can be used to open
+ up holes in a firewall for quick access.
+
+ http://www.zeroflux.org/cgi-bin/cvstrac/knock/wiki
+