vpn solution2 – windows openvpn client 免費的vpn 客戶端

上文提及過 openvpn server的制作方法, 這篇文章會介紹服務器端與客戶端配合的一個例子.

在客戶端方面, 用家大部份都會用 Windows + openvpn. 在 Windows 下安裝 openvpn 十分簡單, 只需要以下步驟

1. 到這裡下載 openvpn 圖形介面客戶端
   http://openvpn.se/files/install_packages/openvpn-2.0.9-gui-1.0.3-install.exe
2. 雙click install.exe 安裝
3. 到 C:\Program Files\OpenVPN\config 創建 / 編輯 ovpn 檔案 (yourservername.ovpn)
4. .opvn示範檔案如下
   1. client
   2. dev tap
   3. proto udp
   4. 
      
   5. # change this to your server’s address
   6. remote 123.123..123..123 1194
   7. resolv-retry infinite
   8. nobind
   9. persist-key
   10. persist-tun
   11. 
       
   12. #tls-client
   13. ca keys/ca.crt
   14. cert keys/keithyau.crt
   15. key keys/keithyau.key
   16. 
       
   17. #ensure that we are talking to a server
   18. ns-cert-type server
   19. 
       
   20. #confirm we are talking to the correct server
   21. #tls-auth ta.key 1
   22. # Select a cryptographic cipher.
   23. # If the cipher option is used on the server
   24. # then you must also specify it her e.
   25. cipher AES-128-CBC
   26. 
       
   27. # Enable compression on the VPN link.
   28. comp-lzo
   29. 
       
   30. #fragment 1400
   31. # enable user/pass authentication
   32. # auth-user-pass
   33. 
       
5. 把鑰匙拷貝到 C:\Program Files\OpenVPN\config\keys , 以下是在服務器端上鑰匙的制法 (把keithyau 換成你的使用者名字, 詳情參考 http://keithyau.wordpress.com/2009/02/07/vpn-solution-2-openvpn/)
   1. sudo su
      cd /etc/openvpn/examples/easy-rsa/2.0/
      source ./vars
      ./clean-all
      ./build-ca
      ./build-key-server server
      ./build-key keithyau
      ./build-dh
      cd keys
      openssl dhparam -out dh1024.pem 1024
      cd ..
      openvpn –genkey –secret ta.key #optional
6. 在右下角 openvpn icon按連接

7. 測試連線

令服務器能接受以上設定的請求, 相應需要以下的設定

# Which local IP address should OpenVPN
# listen on? (optional)
local 192.168.1.102
port 1194
proto udp
dev tap0
#direct these to your generated files
ca /etc/openvpn/examples/easy-rsa/2.0/keys/ca.crt
cert /etc/openvpn/examples/easy-rsa/2.0/keys/server.crt
key /etc/openvpn/examples/easy-rsa/2.0/keys/server.key
dh /etc/openvpn/examples/easy-rsa/2.0/keys/dh1024.pem
ifconfig-pool-persist ipp.txt
#需要 dhcp 服務器 的配合
server 10.3.0.0 255.255.255.0
# 服務器上沒有 dhcp 服務器的請選這行
# server-bridge 192.168.1.102 255.255.255.0 192.168.1.230 192.168.1.231
keepalive 10 120
#encryption
cipher AES-128-CBC
#Push routing configuration
#push “route 192.168.2.0 255.255.255.0″
#tls-auth ta.key 0
comp-lzo
#fragment 1400
#limit the number of connections
max-clients 5
#some secuurity settings
# do not use if running server on Windows
user nobody
group nogroup
persist-key
persist-tun
#log file settings
status openvpn-status.log
verb 3
# authentication plugin
#forces client to have a linux acount in order to connect (Not for Windows user)
# plugin /usr/lib/openvpn/openvpn-auth-pam.so login

這裡有安裝 DHCP server 的方法

sudo apt-get install dhcp3-server
sudo vi /etc/default/dhcp3-server
更改 為 INTERFACES=”br0″ # br0 = 你的網卡名稱

sudo vi /etc/dhcp3/dhcpd.conf

把其中一個示範修改為 (10.3.0.0 是你打算指派的網絡)
subnet 10.3.0.0 netmask 255.255.255.0 {
range 10.3.0.100 10.3.0.200;
option routers 192.168.1.1;
}

/etc/init.d/dhcpd restart
/etc/init.d/openvpn restart

這樣你的 Openvpn 就能成功在 linux → windows 間建立起來了