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Basic tutorial on using TUN/TAP virtual network card in CentOS

function.Virtual Network Card TUN/TAP driver design principle: The tun/tap driver implements the virtual Nic function. tun indicates virtual devices are point-to-point devices, and tap indicates virtual devices are Ethernet devices. These two devices implement different encapsulation for network packets.By using the tun/tap

How to Use OpenVPN and PrivacyIDEA to establish two-factor authentication Remote Access

How to Use OpenVPN and PrivacyIDEA to establish two-factor authentication Remote Access For the company, IT has become a trend to allow employees to access the company's IT resources at home or on a business trip through the VPN remote access system. However, weak employee password management awareness and attacks by attackers using social engineering libraries often provide convenient channels for attackers. The two-factor authentication system is ve

IPSecVPN and OpenVPN-IPSec

IPSecVPN and OpenVPN-IPSec are talking about OpenVPN and other SSLVPN over the IPSec protocol, as a result, IPSec gradually fades out of sight and becomes a dedicated VPN for core networks and ultra-high-end devices. Www.2cto.com if you want to develop a VPN product, OpenVPN is like the pull personnel standing outside the bainahui Mall in different regions, attra

Centos6.4 quickly build an openvpn server based on user name and password authentication

Centos6.4 quickly build an openvpn server based on user name and password authentication Today, VPN applications are widely used. I have previously written a blog on PPTPD. The link is http://cyr5425blog.51cto.com/714067/4101788. The home has recently changed a new broadband. You cannot use the company's PptpdVPN. the dialing status remains at the step of verifying the user name and password. Baidu and Google did not solve this problem. This seems to

OpenVPN Optimization-Establishment of TLS handshake Control CHannel

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

Linux under OpenVPN process exception exit how to Solve

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

Resolve OpenVPN Process Exception exit problem

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

OpenVPN server verified by account and password

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

DEBIAN6 System Configuration OpenVPN Server Tutorial

You need to turn on SSH to connect your cloud server as root or user using sudo to access SSH connections. This guide assumes that users use sudo access. But you can take things using roots only by stripping "sudo" from the start of each command. If you are running Linux or Mac on your system, you can use the SSH terminal program. If you are using Windows, you can use putty to login to SSH. Once the terminal is open, assuming you are using the LINUX/MAC system, you can login to enter the followi

VPS a key to build OpenVPN method detailed

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

Basic tutorial on using TUN/TAP Virtual network card under CentOS

) this.width=650; "alt=" 20151120120604752.jpg (553x396) "src=" http://files.jb51.net/file_images/article/201511/ 20151120120604752.jpg?2015102012612 "style=" border:1px solid rgb (204,204,204); vertical-align:bottom;padding:1px; " />The Tun/tap driver implements the function of the virtual network card, Tun that the virtual is a point-to-point device, tap represents the virtual Ethernet device, both of whi

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 uses Ubuntu as an example to describe how to connect to the remote

[Centos] install openvpn server (easy-rsa3)

[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 code for Centos installation and configuration

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 added script to log log

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/

Use the TAP Nic In Ubuntu

Because n2n is used, the TAP Nic is used. It is very easy to use in Windows. Download The openvpn installer and install only the TAP in it. However, you sometimes need to run the batch processing program under the installation directory, the system will prompt that the driver has not passed the authentication and is not compatible. Force the installation. After t

OpenVPN client configuration tutorial in Ubuntu

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

VPN protocols: PPTP, L2TP, and OpenVPN

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

How to implement OpenVPN on Linux

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 + squid implement http Proxy

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

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