Build a VPN on CentOS

What is a VPN?

VPN is a virtual private network, its function is to establish a private network on the public network, to encrypt communications.

The VPN gateway enables remote access through the encryption of the packet and the conversion of the destination address of the packet. VPN has a variety of classification methods, mainly by protocol classification.

VPN can be implemented by server, hardware, software and many other ways. This article records the construction of the VPN server under the Linux system.

1. Check if you can access the extranet

Ping www.baidu.com

2. Installing the Dependency package PPP

Yum Install Ppp-y

3. Download and install the PPTPD package

wget ftp://mirror.switch.ch/pool/4/mirror/epel/6/x86_64/Packages/p/pptpd-1.4.0-3.el6.x86_64.rpm

If the RPM download link above is not available, visit the following URL to select an rpm download link:

Http://rpm.pbone.net/index.php3/stat/4/idpl/26021844/dir/redhat_el_6/com/pptpd-1.4.0-3.el6.x86_64.rpm.html

4. Modify the configuration file options.pptpd

Vim/etc/ppp/options.pptpd

Find the name option to dismiss the bank comment

Find the ms-dns option to dismiss the bank comment while modifying the DNS address

5. Modify the configuration file pptpd.conf

Vim/etc/pptpd.conf

Find PPP options and dismiss our comments

Find localip options and remoteip options

Among them, Localip 192.168.1.1 #取消这行注释, fill out the IP of the network, indicating the VPN login server address ;

Removeip 192.168.0.222-254 #取消这行注释, the IP pool assigned to the client when the VPN server is connected .

6. Modify the Chap-secrets configuration file to add VPN users

Vim/etc/ppp/chap-secrets

client indicates user name

Secret means password

IP Addresses indicates the IP address of the login (* represents unrestricted login IP)

7. Restart the service

/ETC/INIT.D/PPTPD restart

8. Turn off the firewall

Systemctl Stop firewalld.servicesystemctl Disable Firewalld.servicefirewall-cmd--state

9. Test connectivity

1) Go to Windows 10 settings and click "Network and Internet"

2) Click on VPN option and click "Add VPN Connection"

3) Enter the VPN login information

4) Successful Connection

Build a VPN on CentOS