安装成功后 双击client.ovpn（附件） 选择连接client 弹窗显示connected 则连接成功 二、 Windows系统 windows10 安装包 openvpn-install-2.4.7-I607-Win10.exe.
OpenVPN is a robust and highly flexible VPN daemon. OpenVPN supports SSL/TLS security, ethernet bridging, TCP or UDP tunnel transport through proxies or NAT, support for dynamic IP addresses and DHCP, scalability to hundreds or thousands of users, and portability to most major OS platforms.
OpenVPN is tightly bound to the OpenSSL library, and derives much of its crypto capabilities from it.
OpenVPN supports conventional encryption using a pre-shared secret key (Static Key mode) or public key security (SSL/TLS mode) using client & server certificates. OpenVPN also supports non-encrypted TCP/UDP tunnels.
OpenVPN is designed to work with the TUN/TAP virtual networking interface that exists on most platforms.
Overall, OpenVPN aims to offer many of the key features of IPSec but with a relatively lightweight footprint.
With OpenVPN, you can:
- tunnel any IP subnetwork or virtual ethernet adapter over a single UDP or TCP port,
- configure a scalable, load-balanced VPN server farm using one or more machines which can handle thousands of dynamic connections from incoming VPN clients,
- use all of the encryption, authentication, and certification features of the OpenSSL library to protect your private network traffic as it transits the internet,
- use any cipher, key size, or HMAC digest (for datagram integrity checking) supported by the OpenSSL library,
- choose between static-key based conventional encryption or certificate-based public key encryption,
- use static, pre-shared keys or TLS-based dynamic key exchange,
- use real-time adaptive link compression and traffic-shaping to manage link bandwidth utilization,
- tunnel networks whose public endpoints are dynamic such as DHCP or dial-in clients,
- tunnel networks through connection-oriented stateful firewalls without having to use explicit firewall rules,
- tunnel networks over NAT,
- create secure ethernet bridges using virtual tap devices, and
- control OpenVPN using a GUI on Windows or Mac OS X.
What's New:
Faster Connections
- Connections setup is now much faster
Crypto Specific Changes
- ChaCha20-Poly1305 cipher in the OpenVPN data channel (Requires OpenSSL 1.1.0 or newer)
- Improved TLS 1.3 support when using OpenSSL 1.1.1 or newer
- Client-specific tls-crypt keys (–tls-crypt-v2)
- Improved Data channel cipher negotiation
- Removal of BF-CBC support in default configuration (see below for possible incompatibilities)
Server-Side Improvements
- HMAC based auth-token support for seamless reconnects to standalone servers or a group of servers.
- Asynchronous (deferred) authentication support for auth-pam plugin
- Asynchronous (deferred) support for client-connect scripts and plugins
Network-Related Changes
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- Support IPv4 configs with /31 netmasks now
- 802.1q VLAN support on TAP servers
- IPv6-only tunnels
- New option –block-ipv6 to reject all IPv6 packets (ICMPv6)
Linux-Specific Features
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- VRF support
- Netlink integration (OpenVPN no longer needs to execute ifconfig/route or ip commands)
Windows-Specific Features
- Wintun driver support, a faster alternative to tap-windows6
- Setting tun/tap interface MTU
- Setting DHCP search domain
- Allow unicode search string in –cryptoapicert option
- EasyRSA3, a modern take on OpenVPN CA management
- MSI installer
Important Notices
BF-CBC Cipher is no longer the default
- Cipher handling for the data channel cipher has been significantly changed between OpenVPN 2.3/2.4 and v2.5, most notably there are no 'default cipher BF-CBC' anymore because it is no longer considered a reasonable default. BF-CBC is still available, but it needs to be explicitly configured now.
- For connections between OpenVPN 2.4 and v2.5 clients and servers, both ends will be able to negotiate a better cipher than BF-CBC. By default they will select one of the AES-GCM ciphers, but this can be influenced using the –data-ciphers setting.
- Connections between OpenVPN 2.3 and v2.5 that have no –cipher setting in the config (= defaulting to BF-CBC and not being negotiation-capable) must be updated. Unless BF-CBC is included in –data-ciphers or there is a '–cipher BF-CBC' in the OpenVPN 2.5 config, a v2.5 client or server will refuse to talk to a v2.3 server or client, because it has no common data channel cipher and negotiating a cipher is not possible. Generally, we recommend upgrading such setups to OpenVPN 2.4 or v2.5. If upgrading is not possible we recommend adding value='https://www.techspot.com/downloads/5182-openvpn/similar/'>
I have been using Tunnelblick to connect to the VPN I have configured on my Linksys WRT54GL router running DD-WRT. DD-WRT provides several different tutorials for configuring OpenVPN on your router. Tunnelblick works fairly well on my laptop running Mac OS X most of the time, but every now and then I have had issues connecting. Therefore, I decided to investigate alternatives.
Openvpn Client For Mac Client
I decided to try some variation of what was described in this post on Tony's Cafe. The first step was to install the TunTap driver for Mac OS X. This provides the necessary network interfaces to connect to an OpenVPN. It appears that a reboot is no longer required. For command line simplicity and for scripting purposes, you can use the following to install the TunTap driver.
Openvpn Client Mac Terminal
The post on Tony's Cafe then shows the steps necessary to build OpenVPN from source. You are welcome to do this and you can check it out in the post. However, the simply way is to make use the openvpn binary inside of the Tunnelblick application package. I simply copied it out of the .app and into /usr/sbin. The following again automates the entire process for installing the openvpn binary.
I then created a new OpenVPN configuration file using the example provided in the referenced Tony's Cafe post. The example I used is provided below.
I then plugged in the host to connect to, the IP address and subnet mask for my laptop to use while it is on the road, and the path to the certificates and keys stored on my machine. All that was left was to launch OpenVPN from the command line:
Openvpn Client Mac Command Line
I haven't used this new method of connecting to my VPN extensively; however, so far it appears to be working well.
