How to limit ip address to seure your linux server with examples

Using firewall rules

allow traffic from a specific IP address
To deny traffic from a specific IP address

Using TCP wrappers

allow Access to your ssh server from ip address
allow ip address to Access your ssh server
TCP wrappers with subnet mask

Using buil in firewall

allow or block traffic to or from specific IP address

Using host.allow or host.deny

Limiting access to your Linux server by IP address is an effective way to enhance its security. By doing so, you can restrict access to your server only to trusted users or networks. Here are some examples of how you can limit IP addresses on your Linux server:

1.Using firewall rules

One of the most common ways to limit access to your Linux server by IP address is to use firewall rules. You can use the iptables or ufw firewall to allow or deny traffic from specific IP addresses.

For example, if you want to allow traffic from a specific IP address (e.g. 192.168.0.10) to your SSH server, you can run the following command using iptables

sudo iptables -A INPUT -p tcp --dport ssh -s 192.168.0.10 -j ACCEPT

This will allow incoming SSH traffic from the IP address 192.168.0.10. To deny traffic from a specific IP address, you can replace ACCEPT with DROP.

If you're using ufw, you can use the following commands to allow or deny traffic from a specific IP address:

sudo ufw allow from 192.168.0.10 to any port ssh
sudo ufw deny from 192.168.0.10 to any port ssh

2.Using TCP wrappers