Install Softether for vpnazure.net on Raspberry Pi 3B+

 A. Download VPN server souce code from Softether web site:

1. Browser https://www.softether-download.com/files/softether/
2. Choose the latest version
3. Choose Linux
4. Choose SoftEther_VPN_Server
5. Choose 64bit_-_ARM_64bit
6. Copy the link and download it by wget

wget https://www.softether-download.com/files/softether/v4.44-9807-rtm-2025.04.16-tree/Source_Code/softether-src-v4.44-9807-rtm.tar.gz -O vpnserver.tgz

B. Install VPN server

1. Install required library
   
   sudo apt install libreadline-dev libssl-dev
   
   
2. Untar the source code and make it
   
   tar zxf vpnserver.tgz
   cd vpnserver
   ./configure
   make
   make install
   
   
3. After make install, the vpnserver and vpncmd can be found in the follwing directories
   
   /usr/vpnserver
   /usr/vpncmd
   /usr/bin

C. Configure VPN server

1. Create /etc/init.d/vpnserver for vpnserver to auto start at boot time
   
   sudo vi /etc/init.d/vpnserver
   
   #!/bin/sh
   
   ### BEGIN INIT INFO
   
   # Provides:          vpnserver
   
   # Required-Start:    $local_fs $network
   
   # Required-Stop:     $local_fs $network
   
   # Default-Start:     2 3 4 5
   
   # Default-Stop:      0 1 6
   
   # Short-Description: VPN Server
   
   # Description:       SoftEther VPN Server
   ### END INIT INFO
   
   
   DAEMON=/usr/bin/vpnserver
   LOCK=/var/lock/subsys/vpnserver
   
   . /lib/lsb/init-functions
   
   test -x $DAEMON || exit 0
   case "$1" in
   start)
           $DAEMON start
           touch $LOCK
           ;;
   stop)
           $DAEMON stop
           rm $LOCK
           ;;
   restart)
           $DAEMON stop
           sleep 3
           $DAEMON start
           ;;
   *)
           echo "Usage: $0 {start|stop|restart}"
           exit 1
   esac
   exit 0
   
   
2. Link vpnserver to appropriate boot level
   
   sudo mkdir -p /var/lock/subsys
   sudo chmod 755 /etc/init.d/vpnserver
   sudo update-rc.d vpnserver defaults
   
   
3. Enable ipv4 forwarding by uncomment the following line in /etc/sysctl.conf
   
   sudo vi /etc/sysctl.conf
   
   # Uncomment the next line to enable packet forwarding for IPv4
   net.ipv4.ip_forward=1
   
   
4. Enable vpnserver in systemd
   
   sudo systemctl enable vpnserver
   
   
5. Star vpnserver to create user for vpnserver configuration
   
   sudo /etc/init.d/vpnserver start
   
   

D. Configure VPN server 

    Use vpncmd to do initial configure for VPN server (step 1 to 3) and following configuration may be done by vpncmd command line or through the GUI of SoftEther VPN Server Manager for Windows.

1. Check installation status
   
   Execute vpncmd command, select 1. Management of VPN Server or VPN Bridge, press [Enter] for the first two hostname and virtual hub name question.
   
   sudo /usr/bin/vpncmd
   
   After VPN Server command prompt is shown, use check command to check server status.
   
   VPN Server>check
   
   If installation is correct, it will show that all check are "Pass".
   
   
   
2. Create password for server configuration connection
   
   Use ServerPasswordSet command to set Set VPN Server Administrator Password.
   
   VPN Server>PasswordSet
   
   
3. Select the DEFAULT hub
   
   VPN Server>Hub DEFAULT
   VPN Server/DEFAULT>
   
   
4. Create a user for the DEFAULT hub and set password for the created user
   
   VPN Server/DEFAULT>UserCreate vpn
   
   VPN Server/DEFAULT>UserPasswordSet vpn
   
   
5. Enable Secure NAT for the DEFAULT hub
   
   VPN Server/DEFAULT>SecureNatEnable
   VPN Server/DEFAULT>SecureNatStatusGet
   
   
6. Enable VPN Azure for the VPN Server
   
   VPN Server/DEFAULT>Hub
   VPN Server>VpnAzureSetEnable yes
   VPN Server>VpnAzureGetStatus
   
   
7. Take a note for the Hostname of this VPN Server on VPN Azure Service.

E. Reboot and try it!