Centos 环境

[root@centos-linux ~]# cat /etc/redhat-release
CentOS Linux release 7.4.1708 (Core) 

1. 安装依赖环境 1. 1 通过yum 安装 openssl 和 openssl-devel 模块

[root@centos-linux ~]# yum -y install openssl openssl-devel

  1.2 安装 lzo lzo-devel

[root@centos-linux ~]# yum -y install lzo lzo-devel

  1.3 rpm命令检查安装情况：

[root@centos-linux ~]# rpm -qa | grep lzo 
lzo-devel-2.06-8.el7.x86_64
lzo-minilzo-2.06-8.el7.x86_64
lzo-2.06-8.el7.x86_64
[root@centos-linux ~]# rpm -qa | grep openssl
openssl-libs-1.0.2k-16.el7_6.1.x86_64
openssl-1.0.2k-16.el7_6.1.x86_64
openssl-devel-1.0.2k-16.el7_6.1.x86_64
[root@centos-linux ~]# 

  2. 安装InConnect 所用的客户端 OpenVPN

[root@centos-linux /]# yum -y install openvpn easy-rsa

  3. 下载配置文件，并导入到Centos 系统的 /etc/openvpn/client 文件文件夹   ps: 我登陆服务器是使用的CRT，使用ssh传输文件得安装lrzsz工具，通过rz 命令从本机将文件传给Centos系统下。

[root@centos-linux client]# yum install lrzsz
 
[root@centos-linux client]# cd /etc/openvpn/client/
[root@centos-linux client]# rz

  配置文件被成功上传

[root@centos-linux client]# ls
sunzhandong@foxmail.com.ovpn

  4. 启动OpenVPN 客户端

[root@centos-linux client]# openvpn --daemon --config sunzhandong@foxmail.com.ovpn --log-append /var/log/openvpn.log

  ⚠️ 配置文件为 sunzhandong@foxmail.com.ovpn 是本次测试使用的，请在命令中替换。   将上述命令加到里开机启动。

/etc/rc.local

参数解释：

• daemon：openvpn以daemon方式启动。
• cd dir：配置文件的目录，openvpn初始化前，先切换到此目录。
• config file：客户端配置文件的路径。
• log-append file：日志文件路径，如果文件不存在会自动创建。

  启动日志：

[root@centos-linux client]# cat /var/log/openvpn.log 
Mon Aug 12 16:52:17 2019 OpenVPN 2.4.7 x86_64-redhat-linux-gnu [Fedora EPEL patched] [SSL (OpenSSL)] [LZO] [LZ4] [EPOLL] [PKCS11] [MH/PKTINFO] [AEAD] built on Feb 20 2019
Mon Aug 12 16:52:17 2019 library versions: OpenSSL 1.0.2k-fips  26 Jan 2017, LZO 2.06
Mon Aug 12 16:52:31 2019 ERROR: Failed retrieving username or password
Mon Aug 12 16:52:31 2019 Exiting due to fatal error
Mon Aug 12 16:55:49 2019 OpenVPN 2.4.7 x86_64-redhat-linux-gnu [Fedora EPEL patched] [SSL (OpenSSL)] [LZO] [LZ4] [EPOLL] [PKCS11] [MH/PKTINFO] [AEAD] built on Feb 20 2019
Mon Aug 12 16:55:49 2019 library versions: OpenSSL 1.0.2k-fips  26 Jan 2017, LZO 2.06
Mon Aug 12 16:55:49 2019 WARNING: No server certificate verification method has been enabled.  See http://openvpn.net/howto.html#mitm for more info.
Mon Aug 12 16:55:55 2019 TCP/UDP: Preserving recently used remote address: [AF_INET]54.222.145.115:31247
Mon Aug 12 16:55:55 2019 Socket Buffers: R=[212992->212992] S=[212992->212992]
Mon Aug 12 16:55:55 2019 UDP link local: (not bound)
Mon Aug 12 16:55:55 2019 UDP link remote: [AF_INET]54.222.145.115:31247
Mon Aug 12 16:55:55 2019 TLS: Initial packet from [AF_INET]54.222.145.115:31247, sid=d52be281 825a6a96
Mon Aug 12 16:55:55 2019 VERIFY OK: depth=1, CN=InHand Networks InVPN Server
Mon Aug 12 16:55:55 2019 VERIFY OK: depth=0, O=inhand networks, OU=inhand networks, CN=5bf646e15ffb44000100000e
Mon Aug 12 16:55:55 2019 Control Channel: TLSv1.2, cipher TLSv1/SSLv3 ECDHE-RSA-AES256-GCM-SHA384, 2048 bit RSA
Mon Aug 12 16:55:55 2019 [5bf646e15ffb44000100000e] Peer Connection Initiated with [AF_INET]54.222.145.115:31247
Mon Aug 12 16:55:56 2019 SENT CONTROL [5bf646e15ffb44000100000e]: 'PUSH_REQUEST' (status=1)
Mon Aug 12 16:55:56 2019 PUSH: Received control message: 'PUSH_REPLY,route 10.8.0.0 255.255.0.0,route-gateway 10.8.0.1,topology subnet,ping 40,ping-restart 120,ifconfig 10.8.1.1 255.255.254.0,peer-id 3,cipher AES-256-GCM'
Mon Aug 12 16:55:56 2019 OPTIONS IMPORT: timers and/or timeouts modified
Mon Aug 12 16:55:56 2019 OPTIONS IMPORT: --ifconfig/up options modified
Mon Aug 12 16:55:56 2019 OPTIONS IMPORT: route options modified
Mon Aug 12 16:55:56 2019 OPTIONS IMPORT: route-related options modified
Mon Aug 12 16:55:56 2019 OPTIONS IMPORT: peer-id set
Mon Aug 12 16:55:56 2019 OPTIONS IMPORT: adjusting link_mtu to 1625
Mon Aug 12 16:55:56 2019 OPTIONS IMPORT: data channel crypto options modified
Mon Aug 12 16:55:56 2019 Data Channel: using negotiated cipher 'AES-256-GCM'
Mon Aug 12 16:55:56 2019 Outgoing Data Channel: Cipher 'AES-256-GCM' initialized with 256 bit key
Mon Aug 12 16:55:56 2019 Incoming Data Channel: Cipher 'AES-256-GCM' initialized with 256 bit key
Mon Aug 12 16:55:56 2019 ROUTE_GATEWAY 10.1.1.1/255.255.255.0 IFACE=eth0 HWADDR=00:1c:42:28:04:52
Mon Aug 12 16:55:56 2019 TUN/TAP device tun1 opened
Mon Aug 12 16:55:56 2019 TUN/TAP TX queue length set to 100
Mon Aug 12 16:55:56 2019 /sbin/ip link set dev tun1 up mtu 1500
Mon Aug 12 16:55:56 2019 /sbin/ip addr add dev tun1 10.8.1.1/23 broadcast 10.8.1.255
Mon Aug 12 16:55:56 2019 /sbin/ip route add 10.8.0.0/16 via 10.8.0.1
Mon Aug 12 16:55:56 2019 WARNING: this configuration may cache passwords in memory -- use the auth-nocache option to prevent this
Mon Aug 12 16:55:56 2019 Initialization Sequence Completed

  Centos 路由表

[root@centos-linux client]# route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         gateway         0.0.0.0         UG    100    0        0 eth0
10.1.1.0        0.0.0.0         255.255.255.0   U     100    0        0 eth0
10.8.0.0        0.0.0.0         255.255.254.0   U     0      0        0 tun1
10.8.0.0        10.8.0.1        255.255.0.0     UG    0      0        0 tun1
[root@centos-linux client]# 

  Centos ping 下图路由器IP地址：