Cloud Applications

Many netizens use VPN or proxy when visiting some websites. This article references the methods for building PPTPVPN in OPENVZVPScentos. PPTPVPN is generally supported on the XEN virtual technology VPS. However, many VPS host vendors provide new

IPtables firewall usage tips: Recently, a small LINUX server was set up. because LINUX machines need to be used as soft routers, let's talk about the experience of using IPtables firewall. Iptables is very powerful. For example, IP forwarding and

Among today's many hacking technologies, sniffer is the most common and important technology. Anyone who has used the sniffer tool on windows (for example, netxray and snifferpro) may know that in a shared Lan, using the sniffer tool can provide a

As a result of the project's needs, the network environment implemented by virtual machines, one of which serves as the bridge, all other machines are transitioned through the bridge, so it is implemented using the linux Iptablesnat function. The

On the eth0 server, the external address eth0: 192.168.1.223eth1 is set to the internal address eth1: 11920.2.1. the function to be implemented now is to limit the entire exit to 512 kbit (upload traffic ), download traffic of the 192.168.2 network

Comment: recently, when installing and configuring ORACLE databases in CentOSLinux, the system displays the failure of EM installation due to network ports. I plan to disable the firewall and see the configuration instructions of the firewall, it

The following are common viewing commands used by CentOS system. System # uname-a # View kernel/OS/CPU information # head-n1/etc/issue # View OS # cat/proc/cpuinfo # View CPU information # hostname # View computer name # lspci-TV # List all PCI

I have read a lot of articles about using Iptables to implement port forwarding, but I don't feel very clear about the problem. now I have joined my own setup and usage experience and talked about its implementation process. we have a computer with

IPsecVPN data transmission process the following is a packet transmission process (such as ICMP packet) through the IPsecVPN tunnel ), when the PC in the subnet is protected by the VPN on the left to transmit data to the PC in the VPN on the right

The F system only monitors the communication data packets of the host named hostname. The host name can be a local host or any computer on the network. The following command reads all the data sent by the host hostname: # The Command below the

The most common method for setting automatic service startup is in rc. add a script similar to the following in local: # sshd/usr/local/sbin/sshd # proftpd/usr/local/sbin/proftpd # apache/home/apache/bin/apachectlstart #

The following describes how to define a simple iptables rule: Step 1: clear all defined rules and user-defined rules # iptables-F # iptables-X # iptables-Z Step 2: set the default policy for security and aspect control, set all default policies to

Scenario: locally deploy tomcat to port 8080, and expect local access to port 80 to access local tomcat. Conclusion: The iptables tool in linux is used to implement port forwarding. Specifically for the current get root permission to execute

The Internet environment is as follows: eth0 Internet ip address:. b. c. deth1 intranet ip1: 192.168.0.0/24 for the boss and bteth2 intranet ip2: 192.168.1.0/24 for me and csfans using linux for nat Command:

Written by DontuseHadoopwhenyourdataisntthatbig ": ChrisStucchio, a data scientist with many years of experience, a postdoctoral fellow at the corang Research Institute of New York University, worked as a CTO of a startup company on a high-frequency

TCP is a connection-oriented protocol. before sending data, any interaction must be completed based on the connection. This blog post discusses how to establish a connection. I open a port on the local machine, and telnet the port. after the

Use a script to include these commonly used linux Network Operation Commands. #/Bin/sh # View http request headertcpdump-s1024-l-A-nhost192.168.9.56tcpdump-s1024-l-Asrc192.168.9.56ordst192.168.9.56sudotcpdump-A-s1492dstport8 Use a script to include

The instance disabling ssh port only allows remote ssh login on 192.168.62.1, and prohibit ssh # iptables-AINPUT-s192.168.62.1-ptcp from other computers? # Iptables-AINPUT-ptcp? Dport22-jDROP disable proxy port # iptables-AIN Instance with

Run the following command to generate the/etc/sysconfig/iptables list [root @ centos ~] #/Etc/init. d/iptablesrestart after this operation is completed, the system will automatically generate a ChainRH-Firewall-1-INPUT linked list, but the system

Improper MTU settings may cause many network problems, such as the unavailability of some network applications and the unavailability of some websites. The following are the MTU settings that have been searched online. some of them may not be