By simply using the openvpn proxy, all traffic on the local machine will go through the Remote VPN Server. However, when we roll over the wall, it is generally the traffic webpage, that is, as long as the http traffic goes through the VPN. Openvpn combined with squid's http forward proxy can provide the wall-over function for Web browsing, while other traffic such as QQ and thunder still follows the normal
Openvpn is actually used for transmission at the application layer. You can select UDP/TCP as the transmission protocol. UDP is more commonly used. The reason is described in this article.
Why openvpn network?
If I want to access the network resources of the Organization at home, VPN is a good choice, but in general, setting up a VPN requires a VPN Server, that is, at least one real IP address, this is not
Use OPENVPN to implement Intranet mutual access between two locations (1) master server configurationMaster Server Configuration
Functions to be implemented:
Shenzhen:Master VPN Server: dns.dog.comInternet ip-eth1: 192.168.68.71Intranet ip-eth0: 10.1.1.254Guangzhou:VPN Server: lvs1.dog.comInternet ip-eth1: 192.168.68.73Intranet ip-eth0: 10.1.2.1Clients outside China:192.168.68.79Shenzhen-Guangzhou tunnel uses virtual IP addresses 10.8.0.1 and 10.8.0.
VPN protocols: PPTP, L2TP, and OpenVPN1. Concepts of PPTP, L2TP, and OpenVPN Tunneling Protocols 1. Default port number of PPTP (Point to Point Tunneling Protocol): 1723 PPTP, or PPTF Protocol. This protocol is a new enhanced security protocol developed on the basis of the PPP protocol. It supports multi-protocol Virtual Private Network (VPN) and can pass the password authentication protocol (PAP) and Extended Authentication Protocol (EAP) to enhance
First, the working principle of OpenVPN
VPN technology establishes a private tunnel on the public network through key exchange, encapsulation, authentication and encryption, which guarantees the integrity, privacy and effectiveness of the transmitted data. OpenVPN is a new open source project emerging in recent years, which realizes a sslvpn solution.
Traditional SSL VPN through the port proxy method, the
OpenVPN Optimization-Establishment of TLS handshake Control CHannelAn optimization of the OpenVPN data tunnel is in progress. After referring to the concept and idea of the "giant frame", I carefully considered the design and implementation of the TCP/IP protocol stack, so I come up with a possible error, but at least it is very practical in my scenario: although the upper-layer protocol sends data, it does
After completing the OpenVpn Bridge Mode experiment under UbuntuServer10.04, this experiment on the routing mode involves two modes: the bridging mode and the routing mode, let's take a look at the differences between the two modes. The above content is available on the Internet. I just organized them into tables to make it easier to compare and understand. Experiment environment: (1) topology: (2) The two routers are simulated using the Dynamips simu
First, what is OpenVPN Static Key
According to the official document, the Static Key approach is a point-to-point (point-to-point) VPN.
Second, the advantages of OpenVPN Static Key
1. Easy installation2, easy to use, Windows, OS X, Linux can be used by the official client3, adopt the UDP way, the connection is more stable
Third, the OpenVPN Static Key's disad
Article title: use Openbsd and Openvpn to quickly establish an enterprise VPN. 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 openbsd + openvpn to quickly establish an enterprise vpn
Openvpn can work in two modes:
One is
OpenVPN DoS Vulnerabilities (CVE-2014-8104)
Release date: 2014-12-01Updated on: 2014-6 6
Affected Systems:OpenVPN OpenVPN Access Server Description:Bugtraq id: 71402CVE (CAN) ID: CVE-2014-8104
OpenVPN is an open-source ssl vpn toolkit.
In versions earlier than OpenVPN 2.3.6 and earlier than
Openvpn itself can use an HTTP proxy. That is to say, the openvpn client does not directly connect to the openvpn server, but uses an HTTP proxy for connection. This feature is the peripheral feature of openvpn, not its core, but it can solve many practical problems. It is equivalent to another tunnel outside the tunne
Company demand: Need to build a OpenVPN in the Japanese server, and then through the proxy way to visit foreign sites.
Server IP:
[root@li493-137 ~]# Ifconfig
Eth0 Link encap:ethernet hwaddr f2:3c:91:ae:0a:55
inet addr:57.17.20.30 bcast:57.17.20.255 mask:255.255.255.0
Inet6 ADDR:2400:8900::F03C:91FF:FEAE:A55/64 Scope:global
Inet6 ADDR:FE80::F03C:91FF:FEAE:A55/64 Scope:link
Up broadcast RUNNING multicast mtu:1500 metric:1
RX packets:4620022758
After openvpn has the setenv and reverse push-peer-info that can be pushed, it can theoretically implement bidirectional push of any information, which is too convenient. However, convenience requires a price, that is, it is prone to confusion, errors, and the lack of security. In this world, there are two groups that are hostile to each other. One is how to make nodes more interconnected, and the other is how to control access to communications. In o
Openvpn Bridge Mode in freebsd is probably the most popular semi-non-standard cross-platform VPN solution, with a large number of users and a pure userland implementation. it's pretty easy to set up, but I often forget certain steps so here's a tutorial for me to rememeber in the future :) Keywords: FreeBSD, OpenVPN, networkingI call OpenVPN semi-non-standard bec
Run multiple openvpn clients-linux Enterprise Application-Linux server application information on a Linux machine at the same time. The following is a detailed description. The server configuration is as follows:
Port 1194
Proto tcp
Dev tun
Ca/etc/openvpn/keys/ca. crt
Cert/etc/openvpn/keys/vpnserver. crt
Key/etc/openvpn
Build openvpn based on user password authentication on CentOS 6.6 x64
I. Deployment
For more information about the deployment, see my previous article. Here we will simply modify the previous article.
Http://www.centoscn.com/image-text/config/2015/0717/5874.html
Ii. Modification
# Vim/etc/openvpn/server. conf
Add the following lines of data at the end of the configuration file:
Script-security 3 system
Au
Centos6.3 openvpn client Centos does not provide Openvpn by default, and there is no openvpn in The yum source. if you want to use yum for installation, install EPEL first. Www.2cto. comShell code wgethttp: // apt. sw. be/redhat/e...
Centos6.3 openvpn client Centos does not provide
Directory
1. Install
2. Set up a serious organization to generate a certificate
3. Configure the server
4. Configure the client
1. InstallInstall in UbuntuOpenvpnExtremely simple:
Code:
Sudo apt-Get installOpenvpn
We recommend that you useOpenvpnGUI for Windows installation package, which includesOpenvpnAnd a user-friendly GUI in windows.
2. Set up a serious organization to generate a certificateReferenceOpenvpnIn general, there is no problem.In ubuntu, the direct
Key points and precautions for building openvpn for general enterprises in the centos Environment
Briefly describe the enterprise environment. the ISP is connected to the Firewall of China-made hillstone network. The public IP address is 58. x. The firewall directly connects to the Huawei layer-3 Switch (core). The firewall's intranet interface IP address is 192.168.199.254, and the Management IP address of the layer-3 switch is 192.168.199.1, which b
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