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For example in an 'allow' statement in BIND or in Chrony config files.

Does allow 0.0.0.0/0 mean allowing any clients or allowing no clients?

My question isn't about the specific programs, but just generally what is the correct interpretation of this CIDR notation.

madacoda
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1 Answers1

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It literally means all or any hosts - 99.99% of the time.

The only exception I can provide at hand is the whitelist of Cisco routers, where such "zero whitelist" means negating all hosts. It is a pretty specific case, though.

shodanshok
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