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