Robie: Melindungi "Cara Install Dan Penggunaan OpenVPN Di Ubuntu 20.04" ([Sunting=Hanya untuk pengurus] (selamanya))

2023-08-27T04:14:52Z

Melindungi "Cara Install Dan Penggunaan OpenVPN Di Ubuntu 20.04" ([Sunting=Hanya untuk pengurus] (selamanya))

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Revisi per 27 Agustus 2023 04.14

Robie pada 27 Agustus 2023 04.13

2023-08-27T04:13:36Z

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		Sumber: https://www.cyberciti.biz/faq/ubuntu-18-04-lts-set-up-openvpn-server-in-5-minutes/


		==Step 1 – Update system==

		Run,

		sudo apt update
		sudo apt upgrade

		==Step 2 – Cek IP address==

		Pakai perintah,

		ip a
		ip a show eth0
		ip a show enp0s3

		==Step 3 – Download & run openvpn-install.sh script==

		Pastikan tidak ada yang menggunakan repository ubuntu,

		sudo rm -Rf /var/lib/dpkg/lock

		Sebagai '''User Biasa''', Download,

		sudo chmod 777 /usr/local/src
		cd /usr/local/src/
		wget https://git.io/vpn -O openvpn-install.sh
		chmod +x openvpn-install.sh

		Run,

		sudo ./openvpn-install.sh

		Akan keluar beberapa pertanyaan, tekan [ENTER].

		'''NOTE:''' Jika kita experimen di dalam LAN, sebaiknya 'IP public' yang dipakai adalah IP private Ethernet Server OpenVPN.

		Selesai instalasi, contoh sertifikat ~/client.ovpn akan di keluarkan.

		Hack sedikit

		sudo su
		cp -Rf /etc/openvpn/server/* /etc/openvpn/

		Run OpenVPN,

		sudo systemctl stop openvpn@server # <--- stop server
		sudo systemctl start openvpn@server # <--- start server
		sudo systemctl restart openvpn@server # <--- restart server
		sudo systemctl status openvpn@server # <--- get server status

		==Step 4 – Connect an OpenVPN server using IOS/Android/Linux/Windows client==

		Copykan file sertifikat client.ovpn ke client, misalnya menggunakan perintah,

		scp vivek@104.20.187.5:~/client.ovpn .

		===Linux Desktop: OpenVPN client configuration===

		Install,

		sudo apt -y install openvpn
		sudo cp client.ovpn /etc/openvpn/client.ovpn

		Coba sambungan dari sisi client

		sudo openvpn --client --config /etc/openvpn/client.ovpn

		Linux akan secara automatis tersambung ke computer dengan openvpn script

		sudo systemctl start openvpn@client # <--- start client service

		==Step 5 - Verify/test the connectivity==

		Execute the following commands after connecting to OpenVPN server from your Linux desktop:

		ping 10.8.0.1 # Ping to the OpenVPN server gateway
		ip route # Make sure routing setup working
		dig TXT +short o-o.myaddr.l.google.com @ns1.google.com #Must return public IP address of OpenVPN server

		Beberapa catatan troubleshooting OpenVPN & Client

		Cek OpenVPN server for errors:

		journalctl --identifier ovpn-server

		Cek Filewall Rules

		cat /etc/rc.local

		#!/bin/sh -e
		iptables -t nat -A POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to 172.26.6.74
		exit 0

		Alternatif lain, run iptables command & sysctl command untuk verifikasi NAT rule setup

		sudo iptables -t nat -L -n -v
		sysctl net.ipv4.ip_forward

		Insert rules ke /etc/rc.local (kalau belum di insert)

		sudo sh /etc/rc.local
		sudo sysctl -w net.ipv4.ip_forward=1

		Is OpenVPN server running and port is open? Use the ss command or netstat command and pidof command/ps command:

		$ netstat -tulpn \| grep :1194 ## 1194 is the openvpn server port ##
		$ ss -tulpn \| grep :1194 ## 1194 is the openvpn server port ##
		$ ps aux \| grep openvpn ## is the openvpn server running? ##
		$ ps -C openvpn ## is the openvpn server running? ##
		$ pidof openvpn ## find the openvpn server PID ##

		Verify that OpenVPN server runnign and Port is Open on ubuntu Linux
		If not running, restart the OpenVPN server:
		$ sudo systemctl restart openvpn@server

		Look out for errors:
		$ sudo systemctl status openvpn@server

		Can the Linux desktop client connect to the OpenVPN server machine? First you need to run a simple test to see if the OpenVPN server port (UDP 1194) accepts connections:
		$ nc -vu 104.20.187.5 1194
		Connection to 104.20.187.5 1194 port [udp/openvpn] succeeded!

		If not connected it means either a Linux desktop firewall or your router is blocking access to server. Make sure both client and server using same protocol and port, e.g. UDP port 1194.

		==Conclusion==

		Congratulations. You successfully set up an OpenVPN server on Ubuntu Linux 18.04 LTS server running in the cloud. See the OpenVPN website here and Ubuntu page here for additional information.

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Robie: Melindungi "Cara Install Dan Penggunaan OpenVPN Di Ubuntu 20.04" ([Sunting=Hanya untuk pengurus] (selamanya))

Robie pada 27 Agustus 2023 04.13

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