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OpenVPN Optimization-Establishment of TLS handshake Control CHannel An 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 doe

Before installation, use cat/dev/net/tun to check whether tun/tap [root @ lx_web_s1 ~] is enabled. # Cat/dev/net/tuncat:/dev/net/tun: Filedescriptorinbadstate indicates that tun/tap has been enabled. you can install openVPN and configure the VPN server. 1. install and prepare yum-yinsta. Run cat/dev/net/tun to check whether tun/tap is enabled before installation.[Root @ lx_web_s1 ~] # Cat/dev/net/tunCat:/dev/net/tun: File descriptor in bad stateIt ind

[Centos] install openvpn server (easy-rsa3)VPN is widely used in office and fan wall fields. We may use it in small office networks recently. Learn it first.The vpn server must have a public ip address, which can be used by clients in multiple environments.ConceptPKI: Public Key Infrastructure CA: core of Certificate Authority pkiCentos6.6 in virtual machine environmentNic eth0 Link encap:Ethernet HWaddr 00:50:56:35:E7:EC inet addr:19

OpenVPN server verified by account and password EnvironmentServer: CentOS 6.7 32-bitClient: Windows XP Server Configuration# Disable SELinuxSed-I '/^ SELINUX \ B/s/=. */= disabled/'/etc/selinux/configSetenforce 0 # Install mysql-serverYum-y install mysql-server # Start the mysqld serviceService mysqld start # Initialize the mysql administrator passwordMysqladmin-uroot password RedHat # Create a radius DatabaseMysqladmin-uroot-predhat create radius # I

Code [Root@vpnserver ~]# ntpdate time.nist.gov[Root@vpnserver ~]# Mkdir/byrd/tools-p[Root@vpnserver ~]# Mkdir/byrd/service[Root@vpnserver ~]# cd/byrd/tools/[Root@vpnserver tools]# wget http://www.oberhumer.com/opensource/lzo/download/lzo-2.06.tar.gz #lzo压缩模块[Root@vpnserver tools]# tar zxf lzo-2.06.tar.gz[Root@vpnserver tools]# CD lzo-2.06[Root@vpnserver lzo-2.06]#./configure[Root@vpnserver lzo-2.06]# make make install[Root@vpnserver lzo-2.06]# echo $?0[Root@vpnserver lzo-2.06]# CD ...[Root@vpn

OpenVPN is another VPN software package different from PPTP and L2TP. It is based on ssl vpn. The use of OpenVPN requires client support. Here the system is CentOS6.4.I. Check the environment required by OpenVPNOpenVPN requires support from TUN devices and the nat module of iptables.1. Check the TUN module:Modinfo tunShown as follows: If an error is reported, the TUN device is not supported. 2. In OpenVZ VP

The difference between an OpenVPN internal route and a system route is that the system route completely follows the longest prefix matching principle. After finding the route, the data packet is forwarded from the corresponding Nic interface. Although the routes inside OpenVPN ultimately decide whether to forward and where to forward data packets, this "whether to forward" and "where to forward" is very dif

It is said that now PPTP, L2TP and so on are not very good, and the OpenVPN sometimes seemingly also do not connect (for example, the previous article, on many people can not connect to the reaction installed), this article is about using the OpenVPN Access server free version to build an anti-jamming VPN; OpenVPN Access Server free version only supports

OpenVPN client configuration tutorial in Ubuntu generally, Linux servers that provide Web Services seldom need to connect to OpenVPN, but personal Linux computers often need to connect to OpenVPN. For example, if you use Linux as the development environment, you need to connect to the company's OpenVPN. This document u

The recent OpenVPN service abnormal quit many times, because the original in order to troubleshoot problems record a large number of debug log, resulting in problems when you want to locate the problem is very difficult, the instant log was brushed off, the process dropped, instantaneous start, instantaneous and dropped, resulting in a lot of orders lost! Because the day file records too much useless information, dare not to search the log to locate t

The recent OpenVPN service abnormal quit many times, because the original in order to troubleshoot problems record a large number of debug log, resulting in problems when you want to locate the problem is very difficult, the instant log was brushed off, the process dropped, instantaneous start, instantaneous and dropped, resulting in a lot of orders lost! Because the day file records too much useless information, dare not to search the log to locate t

VPN is a virtual private network, is provided to the enterprise or between the individual and the company security data transmission between the tunnel, OpenVPN is the Linux open source VPN leader, provides the good performance and the friendly user GUI, uses the OpenSSL library encryption and the authentication function. Supports UDP and TCP protocols and provides two kinds of virtual network interfaces: Tun/tap mode. The following is the installatio

OpenVPN is the first choice for VPN servers. There are two solutions for how openVPN breaks through the firewall blocking. One is to use the http-proxy that comes with openVPN, second, use HttpTunnel 1. the http-proxy provided by liopenvpn breaks through the firewall blockingOpenVPN itself can use an http proxy. That is to say, the

1. Environment 1.1. server environment Centos6, kernel version: 2.6.32-71. el6The IP address is 192.168.122.180, and the tunnel IP address is 10.8.0.1. Kernel must support Tun devices and must load iptablesCheck whether Tun is installed: # Modinfo Tun Filename:/lib/modules/2.6.32-71. el6.i686/kernel/Drivers/NET/TUN. KoAlias: Char-Major-10-200License: GPLAuthor: (c) 1999-2004 Max kranyansky maxk@qualcomm.comDescription: Universal tun/TAP Device DriverSrcversion: 7d2aaef89c71c83bbffa0deDe

Use openvpn + linux to quickly establish an enterprise VPN Openvpn introduction http://openvpn.sourceforge.net/, not much said. Openvpn can work in two modes: One is the IP Route mode, which is mainly used for point-to-point One is the Ethernet-based Tunnel Bridge mode, which is applicable to point-to-point and multi-point networks with multiple branches The conf

Details of the Linux neighbor subsystem: confirm-OpenVPN server mode MAC address learning, confirm-openvpnmacIn the article parsing the aging time principle of ARP cache implemented by Linux, I analyzed the conversion of the neighbor subsystem of IPv4 on the Linux protocol stack and again pasted the state machine Conversion Diagram, but this figure is more detailed, because it has an external input, that is, confirm: Note that if the socket or routi

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

Configure openvpn in Ubuntu First, make sure that the apt-Get of ubuntu can find the openvpn package.Sudo apt-Get update Install openvpn packageSudo apt-Get install openvpn Create an openvpn configuration file. The example can be found in the following path:/Usr/share/doc/

OpenVPN Increase the script for logging user log Cat connect.sh #!/bin/bash time= ' Date +%f ' if [-f/etc/openvpn/log/openvpn_$time.log];then touch / Etc/openvpn/log/openvpn_$time.log echo "' Date ' +%f%h:%m:%s ' User $common _name trust_ip $trusted _ip is login, REMOTE_IP is $ifconfig _pool_remote_ip, Mask is $route _netmask_1 ">>/etc/

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