Iptables
Berikut contoh script install iptables dan konfigurasinya :
# !/bin/sh # apt-get update # apt-get install iptables # apt-get install iptables-persistent iptables -V iptables -I INPUT -p tcp -s 192.168.10.202 -j ACCEPT iptables -A INPUT -p tcp --dport 80 -j ACCEPT iptables -A INPUT -p tcp --dport 22 -j ACCEPT iptables -A INPUT -p tcp --dport 443 -j ACCEPT iptables -A INPUT -p tcp --dport 1912 -j ACCEPT iptables -A INPUT -p tcp --dport 3306 -j ACCEPT iptables -A INPUT -p tcp --dport 5432 -j ACCEPT iptables -A INPUT -p tcp -s 192.168.10.0/24 -j DROP iptables -L # iptables-save > /etc/iptables/rules.v4 # systemctl enable iptables-persistent # service iptables-persistent start
DDOS
iptables -A INPUT -p tcp --tcp-flags ALL NONE -j DROP iptables -A INPUT -p tcp ! --syn -m state --state NEW -j DROP iptables -I INPUT -p tcp --dport 80 -m state --state NEW -m recent --set iptables -I INPUT -p tcp --dport 80 -m state --state NEW -m recent --update --seconds 20 --hitcount 10 -j DROP
hanya ada 10 request dalam 20 detik
refensi https://www.youtube.com/watch?v=oSTXOsE3vv8
Kalau ini manual :
# blok port 22 dari ip 192.168.10.0/24 echo "sshd: 192.168.10.0/255.255.255.0" >> /etc/hosts.deny # open port 22 dari ip 192.168.10.202 echo "sshd: 192.168.10.202" >> /etc/hosts.allow # open port 22 dari ip 192.168.10.36 echo "sshd: 192.168.10.36" >> /etc/hosts.allow # open port 22 dari ip 192.168.10.29 echo "sshd: 192.168.10.29" >> /etc/hosts.allow echo "sshd: 192.168.10.19" >> /etc/hosts.allow
Ini agar ketika di restart rule iptables tidak hilang
apt install iptables-persistent