vim /etc/iptables.rule
文件內容如下
*filter # Allows all loopback (lo0) traffic and drop all traffic to 127/8 that doesn't use lo0 -A INPUT -i lo -j ACCEPT -A INPUT ! -i lo -d 127.0.0.0/8 -j REJECT # Accepts all established inbound connections -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT # Allows all outbound traffic # You could modify this to only allow certain traffic -A OUTPUT -j ACCEPT # Allows HTTP and HTTPS connections from anywhere (the normal ports for websites) -A INPUT -p tcp --dport 80 -j ACCEPT -A INPUT -p tcp --dport 443 -j ACCEPT # Allows SSH connections for script kiddies # THE -dport NUMBER IS THE SAME ONE YOU SET UP IN THE SSHD_CONFIG FILE -A INPUT -p tcp -m state --state NEW --dport 22 -j ACCEPT # Allow ping -A INPUT -p icmp -m icmp --icmp-type 8 -j ACCEPT # log iptables denied calls (access via 'dmesg' command) -A INPUT -m limit --limit 5/min -j LOG --log-prefix "iptables denied: " --log-level 7 # Reject all other inbound - default deny unless explicitly allowed policy: -A INPUT -j REJECT -A FORWARD -j REJECT COMMIT
測試這個腳本，iptables-restore < /etc/iptables.rule
如果發現iptables-restore v1.x.x: no command specified的錯誤，就把上面的腳本里面的空行全部刪除，然后再重新回車添加
建立開機啟動，vim /etc/init.d/start-iptables
#! /bin/sh ### BEGIN INIT INFO # Provides: custom iptables # Required-Start: # Required-Stop: # Default-Start: S # Default-Stop: ## Short-Description: custom iptables ### END INIT INFO /sbin/iptables-restore < /etc/iptables.rule
chmod +x /etc/init.d/start-iptables設置執行權限
rcconf添加這個腳本開機啟動