knock Command Examples
Port knocking client to open specific ports on firewall. More information: https://manned.org/knock.
- Knock on ports using different protocols:
knock {{hostname}} {{portnumber}}:{{protocol}}
- Knock on port using UDP:
knock -u {{hostname}} {{portnumber}}
- Force usage of IPv4/IPv6:
knock {{-4|-6}} {{hostname}} {{portnumber}}
- Display errors and details of connection:
knock -v {{hostname}} {{portnumber}}