Cara Install L2TP VPN di VPS Ubuntu, Debian, Centos

wget https://git.io/vpnquickstart -O vpn.sh && sudo sh vpn.sh

ubuntu@nixpoin:~$ wget https://git.io/vpnquickstart -O vpn.sh && sudo sh vpn.sh
--2021-11-06 06:46:36--  https://git.io/vpnquickstart
Resolving git.io (git.io)... 54.162.128.250, 18.205.36.100, 52.204.242.176, ...
Connecting to git.io (git.io)|54.162.128.250|:443... connected.
HTTP request sent, awaiting response... 302 Found
Location: https://raw.githubusercontent.com/hwdsl2/setup-ipsec-vpn/master/extras/quickstart.sh [following]
--2021-11-06 06:46:37--  https://raw.githubusercontent.com/hwdsl2/setup-ipsec-vpn/master/extras/quickstart.sh
Resolving raw.githubusercontent.com (raw.githubusercontent.com)... 185.199.110.133, 185.199.111.133, 185.199.108.133, ...
Connecting to raw.githubusercontent.com (raw.githubusercontent.com)|185.199.110.133|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 6458 (6.3K) [text/plain]
Saving to: ‘vpn.sh’

vpn.sh                        100%[=================================================>]   6.31K  --.-KB/s    in 0s

2021-11-06 06:46:38 (31.4 MB/s) - ‘vpn.sh’ saved [6458/6458]

+ wget -t 3 -T 30 -q -O /tmp/vpn.KM6q0/vpn.sh https://github.com/hwdsl2/setup-ipsec-vpn/raw/master/vpnsetup_ubuntu.sh
## VPN credentials not set by user. Generating random PSK and password...
## VPN setup in progress... Please be patient.
## Installing packages required for setup...
+ apt-get -yqq update
+ apt-get -yqq install wget dnsutils openssl iptables iproute2 gawk grep sed net-tools
## Trying to auto discover IP of this server...
## Installing packages required for the VPN...
+ apt-get -yqq install libnss3-dev libnspr4-dev pkg-config libpam0g-dev libcap-ng-dev libcap-ng-utils libselinux1-dev libcurl4-nss-dev flex bison gcc make libnss3-tools libevent-dev libsystemd-dev uuid-runtime ppp xl2tpd
Extracting templates from packages: 100%
## Installing Fail2Ban to protect SSH...
+ apt-get -yqq install fail2ban
## Downloading IKEv2 script...
+ wget -t 3 -T 30 -q -O ikev2.sh https://github.com/hwdsl2/setup-ipsec-vpn/raw/master/extras/ikev2setup.sh
## Downloading Libreswan...
+ wget -t 3 -T 30 -q -O libreswan-4.5.tar.gz https://github.com/libreswan/libreswan/archive/v4.5.tar.gz
## Compiling and installing Libreswan, please wait...
+ make -j5 -s base
+ make -s install-base
## Creating VPN configuration...
## Updating sysctl settings...
## Updating IPTables rules...
## Enabling services on boot...
## Starting services...

================================================

IPsec VPN server is now ready for use!

Connect to your new VPN with these details:

Server IP: 54.169.116.191
IPsec PSK: gA2TCVbbPrTDzFFwAq5E
Username: vpnuser
Password: hXfeyA3rZS5PVh8C

Write these down. You'll need them to connect!

Important notes:   https://git.io/vpnnotes
Setup VPN clients: https://git.io/vpnclients
IKEv2 guide:       https://git.io/ikev2

================================================

================================================

IKEv2 setup successful. Details for IKEv2 mode:

VPN server address: 54.169.116.191
VPN client name: vpnclient

Client configuration is available at:
/home/ubuntu/vpnclient.p12 (for Windows & Linux)
/home/ubuntu/vpnclient.sswan (for Android)
/home/ubuntu/vpnclient.mobileconfig (for iOS & macOS)

*IMPORTANT* Password for client config files:
SFTFuGTuvtVVeW2e8m
Write this down, you'll need it for import!

Next steps: Configure IKEv2 VPN clients. See:
https://git.io/ikev2clients

================================================

wget https://raw.githubusercontent.com/hwdsl2/setup-ipsec-vpn/master/extras/add_vpn_user.sh

ubuntu@nixpoin:~$ sudo bash add_vpn_user.sh 'usernameku' 'passwordku'

Welcome! Use this script to add or update a VPN user account for both
IPsec/L2TP and IPsec/XAuth ("Cisco IPsec") modes.

If the username you specified already exists, it will be updated
with the new password. Otherwise, a new VPN user will be added.

Please double check before continuing!

================================================

VPN user to add or update:

Username: usernameku
Password: passwordku

Write these down. You'll need them to connect!

Important notes:   https://git.io/vpnnotes
Setup VPN clients: https://git.io/vpnclients

================================================

Do you want to continue? [y/N] y

Adding or updating VPN user...

Done!

Note: All VPN users will share the same IPsec PSK.
      If you forgot the PSK, check /etc/ipsec.secrets.

wget https://raw.githubusercontent.com/hwdsl2/setup-ipsec-vpn/master/extras/del_vpn_user.sh

sudo bash del_vpn_user.sh 'usernameyangingindihapus'