Debian 11 Allow Traffic From selected IPs

sudo apt-get install iptables iptables-persistent

Create file

nano /etc/iptables/rules.v5

paste below lines into the file

##################################

*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]

#replace your ip with 1.1.1.1
-A INPUT -s 1.1.1.1/32 -j ACCEPT

# for outbound traffic

-A OUTPUT -d 1.1.1.1 -j ACCEPT

-A FORWARD -d 1.1.1.1 -j ACCEPT

-A INPUT -j DROP
-A FORWARD -j DROP
-A OUTPUT -j DROP
COMMIT

###############################

Save file and close

Apply rules:-

iptables-restore < /etc/iptables/rules.v5

Now server can access only from 1.1.1.1

Comments

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