OpenVPN: IPv4 /32 multi-client

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sumber: https://www.ostechnix.com/easiest-way-install-configure-openvpn-server-linux/


Topology

CLIENT 1 ------- HOST A ---------------- HOST B
                 ovpn server             ovpn client

                                         HOST C
                                         ovpn client


Host A akan berfungsi sebagai OpenVPN Server. 

OS : Ubuntu 18.04
IP : 192.168.0.239/24
hostname : vpnserver


Host B akan berfungsi sebagai OpenVPN client 

OS : Ubuntu 18.04


Host C akan berfungsi sebagai OpenVPN client 

OS : Ubuntu 18.04


Buat Client Config di Server

Konfigurasi client dibuat di server menggunakan 

cd /usr/local/src/
bash openvpn-install.sh

Keluar 

Looks like OpenVPN is already installed.

What do you want to do?
   1) Add a new user
   2) Revoke an existing user
   3) Remove OpenVPN
   4) Exit
Select an option [1-4]:


Pilih 1 dan akan dibuatkan config untuk client2 dst. File ini ada di /root/client2.ovpn. Copykan file tersebut ke client.

Konfigurasi OpenVPN Client

Pastikan openvpn terinstalsi 

sudo su
apt install openssh-server openvpn

Edit /etc/hosts isi dengan nama OpenVPN server 

192.168.0.239 vpnserver


Jalankan OpenVPN client 

cd ~
sudo su
openvpn --config client2.ovpn

Akan keluar kira-kira 

..
..
Sat Feb 16 08:24:45 2019 TUN/TAP device tun0 opened
Sat Feb 16 08:24:45 2019 TUN/TAP TX queue length set to 100
Sat Feb 16 08:24:45 2019 do_ifconfig, tt->did_ifconfig_ipv6_setup=0
Sat Feb 16 08:24:45 2019 /sbin/ip link set dev tun0 up mtu 1500
Sat Feb 16 08:24:45 2019 /sbin/ip addr add dev tun0 10.8.0.2/24 broadcast 10.8.0.255
Sat Feb 16 08:24:45 2019 /sbin/ip route add 192.168.0.239/32 dev enp0s3
Sat Feb 16 08:24:45 2019 /sbin/ip route add 0.0.0.0/1 via 10.8.0.1
Sat Feb 16 08:24:45 2019 /sbin/ip route add 128.0.0.0/1 via 10.8.0.1
Sat Feb 16 08:24:45 2019 WARNING: this configuration may cache passwords in memory -- use the auth-nocache option to prevent this
Sat Feb 16 08:24:45 2019 Initialization Sequence Completed

Cek interface, akan muncul tun0 

ifconfig

tun0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST>  mtu 1500
        inet 10.8.0.3  netmask 255.255.255.0  destination 10.8.0.2
        inet6 fe80::28c4:3e38:2497:e12a  prefixlen 64  scopeid 0x20<link>
        unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 100  (UNSPEC)
        RX packets 51  bytes 11522 (11.5 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 134  bytes 43524 (43.5 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Cek sambungan 

ping -c3 10.8.0.1

Sample output: 

PING 10.8.0.1 (10.8.0.1) 56(84) bytes of data.
64 bytes from 10.8.0.1: icmp_seq=1 ttl=64 time=0.539 ms
64 bytes from 10.8.0.1: icmp_seq=2 ttl=64 time=1.17 ms
64 bytes from 10.8.0.1: icmp_seq=3 ttl=64 time=0.921 ms

--- 10.8.0.1 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2007ms
rtt min/avg/max/mdev = 0.539/0.878/1.176/0.264 ms

Cek routing 

route -n

Sample output 

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         10.8.0.1        128.0.0.0       UG    0      0        0 tun0


Anda sudah tersambung ke VPN dengan IP 10.8.0.0/24

Referensi


Pranala Menarik

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