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Ubuntu Install UFW firewall sudo apt-get install ufw For general users, only the following settings are required: sudo apt-get install ufw sudo ufw enable sudo ufw default deny The above three commands are safe enough. If you need to open some services, you can use sudo ufw allow. Enable sudo ufw enable sudo ufw default deny #Aft ...

1, What is agent mode The proxy mode provides a proxy for other objects to control access to this object. In some cases, one object is not suitable or can not directly refer to another object, while the proxy object can mediate between the client and the target object, which is characterized by the ...

brief introduction The function of Keepalived is to detect the state of the server. If a web server goes down or fails to work, Keepalived will detect it and remove the failed server from the system. At the same time, other servers will be used to replace the server's work. When the server works normally, Keepalived will automatically add the ...

We often encounter our own regular website links, which are intercepted by wechat for no reason. Everyone is worried about this problem. There are many technologies of domain name anti sealing, two-dimensional code anti sealing and wechat anti red circulating on the network, but the effect is not ideal. ...

Because the upgrade of the customer's version is not successful, considering the manual addition of policies, host information and NAT, this paper studies the following preparation to write the customer's firewall information into a script (ps: from 2000 customer firewall policies, so I think the lazy ...

brief introduction The purpose of NAT penetration is to enable packets with a specific source IP address and source port number to be correctly routed to the intranet host without being shielded by the NAT device. When the computer is in the LAN, the computer nodes of the outer network and the inner network need to connect the communication th ...

brief introduction The purpose of NAT penetration is to enable packets with a specific source IP address and source port number to be correctly routed to the intranet host without being shielded by the NAT device. When the computer is in the LAN, the computer nodes of the outer network and the inner n ...

DHCP Article catalog DHCP What is DHCP How DHCP works Three allocation mechanisms of DHCP Set up DHCP What is DHCP DHCP, the dynamic host configuration protocol, is a local area network protocol. It uses UDP protocol to work. It automatically assigns IP addresses to internal local area netwo ...

My environment is the VMware virtual machine centos7. It's easier to install mysql in win environment, but it's hard to remember various commands when installing in linux. So I sorted out the installation process of Mariadb, Some centos7 has installed MariaDB by default. You can check whether you ha ...

Firewall Configuration Forwarding vsftpd Service Firewall Configuration Forwarding vsftpd Service 1) Turn on passive mode of vsftpd service [root@centos03 ~]# vim /etc/vsftpd/vsftpd.conf pasv_enable=YES pasv_min_port=24500 pasv_max_port=24600 2) Write firewall rules [root@centos01 ~]# iptables -I FO ...