openvpn tap

OpenVPN introduction:OpenVPN can run on most common system platforms and is a VPN solution based on SSL/TLS. OpenVPN can implement layer-2 and layer-3 links based on the TAP/TUN virtual device driver, and provides industry-level encryption based on SSL/TLS, and implements all the features of most common VPN solutions. However, there are not many VPN hardware vend

. Does C2C look like the ip_forward Kernel Parameters in linux? Note: in the previous sections, I have been talking about the destination address, but not the destination IP address. This is because the internal routing of OpenVPN is not only IP routing, but also in the tap mode, its internal route is actually a link layer route. At this time, the OpenVPN server

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/

frame (TAP mode) is sent to the virtual network card. After the service program receives the data and processes the data, it sends the data from the Internet through SOCKET, the remote service program receives data from the Internet through a SOCKET and sends the data to the virtual Nic after corresponding processing. Then, the application software can receive the data and complete one-way transmission, and vice versa. Installation environment: Serve

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

# openvpn uses UDP 5000 port by default Iptables-A input-I Tun +-J acceptIptables-a forward-I Tun +-J accept # these two statements are very important.Iptables-A input-I tap +-J acceptIptables-a forward-I tap +-J accept Iptables-A input-I eth0-J acceptIptables-a forward-I eth0-J accept Iptables-A output-M state -- state new-O eth1-J acceptIptables-A input-M stat

side. If the linkLayer doesn't get this it will regularly reprobe the neighbor (e.g., via a unicast ARP). Only valid on SOCK_DGRAMAnd SOCK_RAW sockets and currently only implemented for IPv4 and IPv6. See arp (7) for details. Because the peer only receives the ping request and directly responds to the ping reply request in the protocol stack, the socket is not involved, and the related confirm such as redirect in the routing subsystem is not involved, therefore, the peer end strictly follows th

OpenVPN-ng: The application-layer tunnel for Mobile Life, And openvpn-ng Application LayerVPN makes people think that it is always a good thing and a way to escape from supervision. In fact, VPN has become the only synonym for escaping from supervision. You see, no matter what technology, IPSec, or WEB Proxy, as long as it is the technology that encrypts the original information, it can all be called VPN, s

Server The http Proxy Server and OpenVPN server can be installed on the same machine.Configure the OpenVPN server (see the previous blog post for installation ): Cat/etc/openvpn/server. conf Port 9091 Proto tcp # Enable tcp Dev tap Ca. crt Cert server. crt Key server. key Dh dh1024.pem Server 10.9.0.0 255.255

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 Devic

OpenVPN server configuration file description (transfer), openvpn configuration file This article describes how to configure the configuration file on the OpenVPN server. In Windows, this configuration file is generally called server. ovpn. in Linux/BSD, this configuration file is generally called server. conf. Although the configuration file name is different, 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