--linode 防火墙设置
vi /etc/iptables.firewall.rules
*filter
# Allow all loopback (lo0) traffic and drop all traffic to 127/8 that doesn't use lo0
-A INPUT -i lo -j ACCEPT
-A INPUT -d 127.0.0.0/8 -j REJECT
# Accept all established inbound connections
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
# Allow all outbound traffic - you can modify this to only allow certain traffic
-A OUTPUT -j ACCEPT
# Allow HTTP and HTTPS connections from anywhere (the normal ports for websites and SSL).
-A INPUT -p tcp --dport 80 -j ACCEPT
-A INPUT -p tcp --dport 443 -j ACCEPT
-A INPUT -p tcp --dport 3306 -j ACCEPT
# Shadowsock
#-A INPUT -p tcp --dport 68177 -j ACCEPT
#-A INPUT -p udp --dport 69233 -j ACCEPT
# Allow SSH connections
#
# The -dport number should be the same port number you set in sshd_config
#
-A INPUT -p tcp -m state --state NEW --dport 22 -j ACCEPT
# Allow ping
-A INPUT -p icmp --icmp-type echo-request -j ACCEPT
# Log iptables denied calls
-A INPUT -m limit --limit 5/min -j LOG --log-prefix "iptables denied: " --log-level 7
COMMIT
#生效'
iptables-restore < /etc/iptables.firewall.rules
#保存防火墙规则
service iptables save
#重起生效
service iptables restart
查看iptables规则及编号
iptables -L -n --line-number
#删除规则
iptables -D INPUT 2
iptables -D OUTPUT 2