What does the IP "192.168.1.1/24" indicate?

Question

Possible Duplicate:
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...

@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

score 7 · Answer 1 · answered May 24 '10 at 14:48

7

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.

answered May 24 '10 at 14:48

jlliagre

score 3 · Answer 2 · edited Apr 13 '17 at 12:14

3

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

edited Apr 13 '17 at 12:14

Community

answered May 24 '10 at 14:48

user9517

score 1 · Answer 3 · answered May 24 '10 at 14:48

1

Yes it means 127.0.0.1 and 192.168.1.* are allowed.

answered May 24 '10 at 14:48

radius

3 Answers3