firewall configuration checklist

)*ipables–t filter–a input–s 0.0.0.0/0–d 202.200.200.1–p tcp–dport 80–j ACCEPT*ipables–t filter–a input–s 0.0.0.0/0–d 0.0.0.0/0–j DROP*iptables–tfilter–a output–s 202.200.200.1–p–sport 80–j ACCEPT*iptables–tfilter–a output–s 0.0.0.0/0–d 0.0.0.0/0–j DROP(3) for the DMZ port: (both have-I DMZ or –ODMZ, cannot be opened): repetitive*iptables–t filter–a input–s 192.168.1.0/24–d 192.168.254.2–p tcp–dport 21,22–j ACCEPT*iptables–tfilter–a input–s 192.168.2.0/24–d 192.168.254.1–p tcp–dport 80–j ACCEPTI

--dport 80 -j ACCEPT-A INPUT -p tcp -m state --state NEW -m tcp --dport 443 -j ACCEPT-A INPUT -p icmp -m limit --limit 100/sec --limit-burst 100 -j ACCEPT-A INPUT -p icmp -m limit --limit 1/s --limit-burst 10 -j ACCEPT-A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,ACK SYN -j syn-flood-A INPUT -j REJECT --reject-with icmp-host-prohibited-A syn-flood -p tcp -m limit --limit 3/sec --limit-burst 6 -j RETURN-A syn-flood -j REJECT --reject-with icmp-port-unreachableCOMMIT# iptables-restore #使防火墙规则生效#

All operations on this computer are normal after the MySQL server is installed, but the MySQL server is not connected remotely on other machines. shit!Suspect is a port problem, the result:Telnet 192.168.1.245 3306The connection was not found, so the port was restricted by the firewall.Now all you have to do is open port 3306 in the firewall.Execution Vi/etc/sysconfig/iptables:-A rh-firewall-1-input-m state--state new-m tcp-p TCP--dport 3306-j ACCEPTT

Firewall commandService Iptables stop--stopService iptables Start--StartFile/etc/sysconfig/ iptables# Firewall configuration written by System-config-firewall# Manual Customization of this file was not recommended.*filter:input accept [0:0]:forward Accept [0:0]:output accept [0:0] -A input-m state--state established,re

Permanent, no recovery after rebootChkconfig iptables onChkconfig iptables offImmediate effect, recovery after rebootService Iptables StartService Iptables StopIt should be stated that for other services under Linux, the above command can be used to perform the open and close operations.When the firewall is turned on, make the following settings, open the relevant port,Modify the/etc/sysconfig/iptables file to add the following:-A rh-

To view the status of a firewall:/etc/init.d/iptables status or service iptables status1) temporary entry into force, recovery after restartOpen: Service iptables startOFF: Service iptables stop or/etc/init.d/iptables stopRestart:/etc/init.d/iptables restart2) Permanent, no recovery after rebootOpen: Chkconfig iptables onOFF: Chkconfig iptables offWhen the firewall is turned on, make the following settings

CentOS Linux firewall configuration and shutdown Firewall shutdown, turn off its services: To view firewall information:#/etc/init.d/iptables status To turn off the Firewall service:#/etc/init.d/iptables stop Permanently closed. Do not know how a permanent method:#chkconfig

rules.Figure 1. protocol stack bottom-level implementationFigure 2. NetFilter implementationIptables Introduction???? Iptables mainly includes four aspects of function:???????? Filter function can be configured on the input chain, output chain, forward chain???????? NET (address translation function) can be configured in Prerouting chain, postrouting chain, output chain???????? Mangle (change header) can be configured on five chains???????? Raw (RAW format) configurable in prerouting chain and

Ciscoasa (config) # Crypto key generate RSA modulus 1024Specifies the size of the RSA coefficients, the larger the value, the longer it takes to generate RSA, the Cisco recommends using 1024.Warning:you has a RSA keypair already defined named Warning: You have an RSA key pair defined by the named Do you really want to replace them? [yes/no]: YDo you really want to replace them? [Yes/no]:yKeypair generation process begin. Please wait ...The start of the key pair generation process. Please wait ..

Tomcat1, decompression tomcat, and then modify the directoryTAR-ZVXF apache-tomcat-7.0.55.tar.gzAfter the decompression, modify the directoryMV apache-tomcat-7.0.55 TOMCAT72. Configure Environment variablesVi/etc/profileAdd the following:Export TOMCAT_HOME=/DATA/TOMCAT7Save and exit, and then executeSource/etc/profile3. Start TomcatCd/data/tomcat7./startup.sh Iv. Configuration of Firewalls1. Close Firewall

The L2TP tunnel (L2TP tunnel) refers to the logical link between the second-tier Tunneling Protocol (L2TP) endpoints: LAC (L2TP access aggregator) and LNS (L2TP network server). When LNS is a server, LAC is the initiator of the tunnel and waits for the new tunnel. Once a tunnel is established, the new communication between this point will be two-way. In order to be useful to the network, high-level protocols such as Point-to-Point Protocol (PPP) are then passed through the L2TP tunnel. Today, j

For LVS persistent connections, there are three types of PCC,PPC and persistent connections based on firewall tags 1.PCC is used to enable all accesses of a user to be directed to the same realserver within the timeout period 2.PPC is used to redirect a user's access to the same service within the timeout period to the same srealserver 3. Persistent connections based on the firewall tag The topology map

: Cmd. Exe,net. Exe,net1. EXE, and the Recycle Bin directory retains only the full permissions of the administrator and system, as shown in the figure: Deletes the Intepub directory that was generated after IIS was installed. The directory security permissions are set. PHP Security Settings Because this article says security, skip the PHP installation steps. Edit the PHP configuration file and open the php.ini with a text editor. Make the foll

Requirements: Want to do snat through PIX to make intranet users online, and then do Dnat to access the Internet IP HTTP service, SSH service to 192.168.4.2 HTTP service, SSH service, to 192.168.4.2 Open this pix telnet service pix515 Firewall Configuration Policy instance #转换特权用户 Pixfirewall>ena pixfirewall# #进入全局配置模式 pixfirewall# conf t #激活内外端口 Interface Ethernet0 Auto Interface Ethernet1 Auto #下面两句配置内外端口

Description This document describes the mailing address filtering configuration for all fortigate devices. FortiGate can identify and filter e-mail addresses. All mail filtering functions need to send and receive mail using mail client software (such as Microsoft Outlook,outlook express,foxmail). Environment Introduction: This article uses FORTIGATE110C to do the demo. The system version supported in this article is Fortios v4.0. Step one: Create

: [UFW BLOCK]: This is where the description of the recording event begins. In this example, it means that the connection is blocked. In: If it contains a value, then the event is an incoming event Out: If it contains a value, then the event is an outgoing event Mac: Combination of destination and source MAC address SRC: IP of package source DST: IP for package destination LEN: Packet length TTL: Packet ttl, or time to live. Before the destina