knock
A Port-Knocking Client
The server part (package knockd) listens to all traffic on an ethernet (or PPP) interface, looking for special "knock" sequences of port hits. This client makes these port hits by sending a TCP (or UDP) packet to a port on the server. This port does not need to be open. Since knockd listens at the link-layer level, it sees all traffic even if it is 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.
No hay ningún paquete oficial disponible para openSUSE Leap 15.5Distribuciones
openSUSE Tumbleweed
openSUSE Leap 15.5
openSUSE Leap 15.4
SUSE SLE-15-SP2
SUSE SLE-15-SP1
SUSE SLE-12-SP5
Distribuciones sin soporte
Las siguientes distribuciones no tienen soporte oficial. Use estos paquetes por su cuenta y riesgo.