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meaning of CIDR mask in pg_hba.conf - Mailing list pgsql-general

From Atul Kumar
Subject meaning of CIDR mask in pg_hba.conf
Date
Msg-id CA+ONtZ5KiFwFKpV+YkRxdACnd+1cJEeuwO-P+P69i7R_1DiD0w@mail.gmail.com
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Responses Re: meaning of CIDR mask in pg_hba.conf  ("Steve Pointer" <spointer@humdai.net>)
Re: meaning of CIDR mask in pg_hba.conf  (Adrian Klaver <adrian.klaver@aklaver.com>)
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Hi,

I have postgres version 12 running on centos 7.

I found an entry in my pg_hba.conf entry as given below under IPV4 connections:

host   all   all  <remote_ip>/0  md5

I could not understand the meaning of "/0" here.

as I know that each IPV4 there are total 4 octets and each octet will be read based on given CIDR mask (/8, /16, /24 or /32) but  I am watching first time "/0" that I couldn't understand, So please help me in explaining its prompt meaning and how IP will be read with /0?



Regards,
Atul

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