[TUTORIAL] VPN Server SoftEther on Proxmox LXC or VM Alpine Linux

[q9on8]

I spent 5 months to get the VPN server SoftEther working on PROXMOX. Finally, I did it on LXC but not on VM.
This is my notes for LXC:
Enable all repositories
cat /etc/apk/repositories
drop "#" for community row (https://wiki.alpinelinux.org/wiki/Repositories)

apk update && apk upgrade

pre-install preparation:

apk add --no-cache \
      binutils \
      build-base \
      readline-dev \
      openssl-dev \
      ncurses-dev \
      git \
      cmake \
      gnu-libiconv \
      zlib-dev \
      libsodium \
      libsodium-dev

(better under root)
git clone https://github.com/SoftEtherVPN/SoftEtherVPN_Stable.git
ls
cd SoftEtherVPN_Stable
./configure
make
make install
vpnserver start

Config here: /usr/local/libexec/softether/vpnserver/vpn_server.config

you can drop unnecessary apk:

apk del binutils build-base ncurses-dev cmake gnu-libiconv zlib-dev libsodium libsodium-dev

Now it is possible to connect to SoftEther with "SE-VPN Server Manager (Tools)". Create USERS, but users can`t establish VPN tunnels because of no rights to get new IPs to SoftEther.

To fix it LXC should be stopped.

On Proxmox host should do the similar as https://pve.proxmox.com/wiki/OpenVPN_in_LXC
nano /etc/pve/lxc/[ID_of_your_LXC].conf
Add the following lines at the end (if you're using PVE < 7.0, change `cgroup2` with `cgroup`)

lxc.cgroup2.devices.allow: c 10:200 rwm
 lxc.mount.entry: /dev/net dev/net none bind,create=dir

Run on host

chown 100000:100000 /dev/net/tun

to give permission for LXC`s to get IP`s on host.

Start LXC. All should work.

I will be grateful if somebody can help run SoftEther in the VM.

PS and maybe there is a more secure way than "chown 100000:100000 /dev/net/tun" to give multiple IP`s for LXC`s / VM`s.