（二）在ubuntu20.04安装VPN服务
2.在PC端安装openVPN客户端。
1.下载OpenVPN
open-install-2.3.0-I005-x86_64.exe
http://swupdate.open.org/community/releases/open-install-2.3.0-I005-x86_64.exe
安装步骤安装：
安装完毕后，右键属性，选择兼容性，修改如下
点击运行会出现
但此时因为配有配置client配置文件无法连接设备。
1.配置OpenVPN 客户端
C:\Program Files\OpenVPN\config目录下copy ubuntu生产ca.crt ，yangxd.crt,yangxd.key
client.o也是由ubuntu
/usr/share/doc/open/examples/sample-config-files/client.conf 更名而来的
client.o的内容如下：
# 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 #网卡
# 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 MyTap
# Are we connecting to a TCP or
# UDP server? Use the same setting as
# on the server.
;proto tcp
proto tcp #TCP协议
# The hostname/IP and port of the server.
# You can have multiple remote entries
# to load balance between the servers.
remote xxx.nangaoyun.com 17017 #域名/公网IP地址+映射端口，这个跟frp相关，这个需要提前设置frp相关配置
;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 nogroup
# 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 #CA证书
cert yangxd.crt #证书
key yangxd.key #私有密钥
# Verify server certificate by checking that the
# certicate has the correct key usage set.
# This is an important precaution to protect against
# a potential attack discussed here:
# http://open.net/howto.html#mitm
#
# To use this feature, you will need to generate
# your server certificates with the keyUsage set to
# digitalSignature, keyEncipherment
# and the extendedKeyUsage to
# serverAuth
# EasyRSA can do this for you.
#remote-cert-tls 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.
# Note that 2.4 client/server will automatically
# negotiate AES-256-GCM in TLS mode.
# See also the ncp-cipher option in the manpage
#cipher AES-256-CBC
# 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
至此openVPN客户端就配置号了。
双击电脑连接设备就可以了。但实际上可能还是不通的，因为没有公网IP地址
注：上边能够完成因为在做此至此配置了frp。
所以
三.搭建frp服务器实现ubuntu的内网IP地址和端口映射
用来解决外网上访问remote地址如何映射到ubuntu上。
下载 https://github.com/fatedier/frp/releases frp软件
1.在公网IP地址上安装frp ，例如ubuntu等等，可以执行tar -zxvf frp.xxx.tar.gz，然后配置frps.ini PORT为指定PORT
[common]
server_addr = 127.0.0.1
server_port = 7000
在ubuntu上同样安装frpc，然后配置frpc.ini如下
[common]
server_addr = 公网域名或者IP地址
server_port = 7000
token = nangao@2021
[ssh_17007]
local_ip = 127.0.0.1
local_port = 1194 #的端口
remote_port =17017
这样我们就可以在的客户端使用公网IP地址+17017端口进行登录了。
支持完成所有搭建，如大致原理图下：
