openvpn工具筆記

在公司中用到openVPN工具，其中踩了不少坑，羅列一下注意點：

• config配置檔案：證書密鑰路徑容易寫錯，下面是openvpn檔案内容

# Specify that we are a client and that we
# will be pulling certain config file directives
# from the server.
client
 
# Use the same setting as you are using on
# the server.
# On most systems, the VPN will not function
# unless you partially or fully disable
# the firewall for the TUN/TAP interface.
dev tap
;dev tun
 
# Windows needs the TAP-Win32 adapter name
# from the Network Connections panel
# if you have more than one. On XP SP2,
# you may need to disable the firewall
# for the TAP adapter.
dev-node Tap  #網卡名
 
# Are we connecting to a TCP or
# UDP server? Use the same setting as
# on the server.
proto tcp
;proto udp
 
# The hostname/IP and port of the server.
# You can have multiple remote entries
# to load balance between the servers.
remote 202.120.111.79 1194     #vpn伺服器IP，端口
;remote my-server-2 1194
 
# Choose a random host from the remote
# list for load-balancing. Otherwise
# try hosts in the order specified.
;remote-random
 
# Keep trying indefinitely to resolve the
# host name of the OpenVPN server. Very useful
# on machines which are not permanently connected
# to the internet such as laptops.
resolv-retry infinite
 
# Most clients don't need to bind to
# a specific local port number.
nobind
 
# Downgrade privileges after initialization (non-Windows only)
;user nobody
;group nobody
 
# Try to preserve some state across restarts.
persist-key
persist-tun
 
# If you are connecting through an
# HTTP proxy to reach the actual OpenVPN
# server, put the proxy server/IP and
# port number here. See the man page
# if your proxy server requires
# authentication.
;http-proxy-retry # retry on connection failures
;http-proxy [proxy server] [proxy port #]
 
# Wireless networks often produce a lot
# of duplicate packets. Set this flag
# to silence duplicate packet warnings.
;mute-replay-warnings
 
# SSL/TLS parms.
# See the server config file for more
# description. It's best to use
# a separate .crt/.key file pair
# for each client. A single ca
# file can be used for all clients.
ca ca.crt             #證書
;cert client.crt     #VPN伺服器上自己生成的證書
;key client.key    #VPN伺服器上自己生成的密鑰
 
# Verify server certificate by checking
# that the certicate has the nsCertType
# field set to "server". This is an
# important precaution to protect against
# a potential attack discussed here:
# http://openvpn.net/howto.html#mitm
#
# To use this feature, you will need to generate
# your server certificates with the nsCertType
# field set to "server". The build-key-server
# script in the easy-rsa folder will do this.
ns-cert-type server
 
# If a tls-auth key is used on the server
# then every client must also have the key.
tls-auth ta.key 1
 
# Select a cryptographic cipher.
# If the cipher option is used on the server
# then you must also specify it here.
;cipher x
 
# Enable compression on the VPN link.
# Don't enable this unless it is also
# enabled in the server config file.
comp-lzo
 
# Set log file verbosity.
verb 3
 
# Silence repeating messages
;mute 20
 
ifconfig-noexec
auth-user-pass
           

• 新增網卡，配置檔案中寫了什麼名字，需要手動添加相對應的網卡名，win7/win10都一樣，也可以注釋掉，網卡名就無所謂了
• 在公司中一般本身就是内部網，我們有時會需要外網，一般已經配了代理，這時再配内部的openVPN，需要在浏覽器代理上勾選，忽略網段,以win10為例