Network Security Internet Technology Development Database Servers Mobile Phone Android Software Apple Software Computer Software News IT Information

In addition to Weibo, there is also WeChat

Please pay attention

WeChat public account

Shulou

Linux CentOS6.5 Firewall (shuts down ports other than providing system services)

2025-04-03 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Servers >

Share

Shulou(Shulou.com)06/02 Report--

1. Allow SSH service to connect, otherwise it cannot connect remotely to the server (add input chain rule: tcp protocol opens port 22 to accept action)

#iptables -A INPUT -p tcp --dport 22 -j ACCEPT

2. Set the default rule. The default is to prohibit all inbound connections and open outbound connections.

(1) Set the default incoming packet to drop. (That is, the machine does not accept any connections by default, unless the rules for receiving are set on the INPUT chain.)

#iptables -P INPUT DROP

(2) Set default to allow outgoing packets

#iptables -P OUTPUT ACCEPT

(3) Set default rule: forward to discard

#iptables -P FORWARD DROP

3. Then open the port that needs to provide services to the outside world, such as opening port 80 (add input chain rule: allow tcp protocol to open port 80 action to accept)

#iptables -A INPUT -p tcp --dport 80 -j ACCEPT

4. Preservation rules

#service iptables save

5. Restart iptables entry into force rules

#service iptables restart

Note: Commands are automatically saved to/etc/sysconfig/iptables.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.

Views: 0

*The comments in the above article only represent the author's personal views and do not represent the views and positions of this website. If you have more insights, please feel free to contribute and share.

Share To

Servers

Wechat

© 2024 shulou.com SLNews company. All rights reserved.

12
Report