How to whitelist IP on Centos?

Question

linux

Hello everyone, please do not judge strictly, but I need help. There is a VDS with SSH access. I'm new to Linux, everything I need has already been configured, it remains only to make an IP whitelist, but I just can't figure out how to do it. Purpose of the whitelist.
For example, my vds is located in Russia in Moscow, I have a list of ip ranges of all users in Moscow and I want to connect to the server, only users from Moscow who fall on the list of ranges can access sites. How can this be implemented in CentOS ? Thank you in advance .

Answer 1

man iptables
man ipset
For example:
Create a table
/etc/sysconfig/ipset:

create anynodes hash:net family inet hashsize 1024 maxelem 65536 
add anynodes 192.168.1.0/24
add anynodes 192.168.10.0/24
add anynodes 192.168.15.0/24
add anynodes 192.168.16.0/24

Here anynodes is just an arbitrary table name in
/etc/sysconfig/iptables:

*filter
:INPUT DROP [0:0]
-A INPUT -p tcp --dport 22 -m set --match-set anynodes src -j ACCEPT
-A OUTPUT -p tcp --sport 22 -m set --match-set anynodes dst -j ACCEPT

We allow access via ssh only to addresses included in anynodes (the rest will be cut off by the default rule)

Answer 2

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