linux firewall book

What is a firewall? Firewalls can be software such as 360, Jinshan, Kaspersky, or hardware. We can use the OSI Layer-7 model to divide the firewall. It can be divided: 1. layer-3 firewall: It is only responsible for checking whether the data flows from the entry to the layer-3 and from the layer-3 to meet the requirements set by the

Original address: http://www.cnblogs.com/ggjucheng/archive/2012/08/19/2646466.htmliptables IntroductionNetfilter/iptables (referred to as iptables) constitutes a packet filtering firewall under the Linux platform, like most Linux software, this packet filtering firewall is free, it can replace expensive commercial

Article Title: Linux system Firewall prevents DOS and DDOS attacks. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. Use the firewall fun

Friends who often use CentOS may encounter the same problems as me. The firewall is turned on and the 80 port is inaccessible, and the friend who just started learning CentOS can refer to it.Friends who often use CentOS may encounter the same problems as me. The recent installation of the ORACLE database under the Linux CentOS Firewall has led to the failure of t

Introduction: A Good article about the Linux firewall iptables configuration, Linux firewall configuration is critical, this involves the server security, security is not absolute, but iptables with good can eliminate most of the gray temptation. Reprinted to the Old Bar blog, more iptables configuration can consult th

The command to turn off a service such as a firewall in a previous release isService Iptables StopOr/etc/init.d/iptables stopTurn off boot:#chkconfig iptables offIn RHEL7, in fact, there is no such service[Email protected] ~]# cat/etc/redhat-releaseRed Hat Enterprise Linux Server Release 7.1 (MAIPO)[[Email protected] ~]# service iptables stopRedirecting To/bin/systemctl Stop Iptables.service[[email protecte

Linux is configured as a proxy firewall-Linux Enterprise Application-Linux server application information. The following is a detailed description. Linux itself can act as a proxy firewall by adding a socket package, and it is fre

Linux on/off firewall command one. Open/Close firewall command under Linux1) Permanent, no recovery after rebootOpen: Chkconfig iptables on off: chkconfig iptables off 2) immediate effect, restart after restart: Service iptables start off: Service iptables stop needs to be explained is for other services under Linux ca

Recently I was learning Linux. Build a LNMP environment. Everything is fine during the test. Then restart Linux. Visiting the website again cannot be opened. The final reason is that there are no rules to join port 80 in the firewall. Here's how:It is very necessary to configure the Iptables firewall under CentOS. Come

-- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt: 22 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt: 80 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt: 25 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-withicmp-host-prohibited We can see that when I installed linux, I chose to have a firewall and opened ports 22, 80, and 25. If you do not choose to start the firewall