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Server Fault Wiki: How does Subnetting Work?

I'm setting up rsync and I see this in the config file:

hosts allow = 127.0.0.1 192.168.1.1/24

Does this indicate that all hosts on the local (192.168.1.*) can use rsync? It's been awhile since my networking class; I just want to understand...

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marked as duplicate by Warner, Kyle Brandt, splattne May 24 '10 at 16:50

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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@warner @kyle @splattne This question is much more specific and concise then the link you provided. What if someone didn't know this was subnetting? Ridiculous that this was closed; stop with the itchy trigger fingers people. You're doing more harm than good. –  mmattax May 25 '10 at 14:43

3 Answers 3

Indeed, that means the first 24 bits of the 192.168.1.1 address are required while the remaining eight can be anything. This is called CIDR.

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Yes. The notation is CIDR - have a look here for some more discussion.

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Yes it means 127.0.0.1 and 192.168.1.* are allowed.

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