Linux CentOS, Debian uses iptables to block IP and delete IP

Linux CentOS, Debian uses iptables to block IP and delete IP

#Add shielded IP

#Ban this IP from accessing the server

iptables -I INPUT -s 1.2.3.4 -j DROP iptables -A INPUT -s 1.2.3.4 -j DROP

#Forbid the server to access this IP

iptables -A OUTPUT -d 1.2.3.4 -j DROP

If you want to block a certain network segment:

iptables -I INPUT -s 1.2.3.0/24 -j DROP

#Clear blocked IP

iptables -t filter -D INPUT -s 1.2.3.4 -j DROP iptables -t filter -D OUTPUT -d 1.2.3.4 -j DROP

#Clear all rules with one click

iptables -F

#View

iptables -L INPUT

or

iptables -L

or

iptables-save (this command will save the rules and execute them automatically next time you boot up)

#Process the number of IP fragments to prevent attacks, allowing 100 per second

iptables -A FORWARD -f -m limit --limit 100/s --limit-burst 100 -j ACCEPT

#Set ICMP packet filtering, allowing 1 packet per second, and limiting the trigger condition to 10 packets

iptables -A FORWARD -p icmp -m limit --limit 1/s --limit-burst 10 -j ACCEPT

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