OpenVPN: IPv6 /128 single client
sumber: https://www.ostechnix.com/easiest-way-install-configure-openvpn-server-linux/
Topology
CLIENT 1 ------- HOST A ---------------- HOST B --------- CLIENT 2
ovpn server ovpn client
2345::1/64
Host A akan berfungsi sebagai OpenVPN Server.
OS : Ubuntu 18.04 IP : 192.168.0.239/24 (IP public) hostname : vpnserver
Host B akan berfungsi sebagai OpenVPN client
OS : Ubuntu 18.04
Instal & Konfigurasi OpenVPN Server
Download script openvpn-install dari github
sudo su apt install openssh-server openvpn cd /usr/local/src wget https://git.io/vpn -O openvpn-install.sh bash openvpn-install.sh
Jawab pertanyaan:
IP address: 192.168.0.239 Public IP address / hostname: vpnserver Protocol [1-2]: 1 -- UDP Port: 1194 DNS [1-5]: 1 Client name: client Press any key to continue... <ENTER>
Maka akan tampak file client.ovpn, di
/root/client.ovpn
Install openssh-server di client, copykan client.ovpn ke client
scp client.ovpn root@192.168.0.237:
Reboot
shutdown -r now
Cek kondisi jaringan
ifconfig
Akan muncul interface tun0
tun0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST> mtu 1500
inet 10.8.0.1 netmask 255.255.255.0 destination 10.8.0.1
inet6 fe80::eaaa:77ed:ba02:748 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 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 6 bytes 288 (288.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
Konfigurasi IPv6 Server
Enable IPv6 forwarding
echo 1 > /proc/sys/net/ipv6/conf/all/forwarding echo 1 > /proc/sys/net/ipv6/conf/default/forwarding echo 1 > /proc/sys/net/ipv6/conf/enp0s3/forwarding echo 1 > /proc/sys/net/ipv6/conf/enp0s8/forwarding echo 1 > /proc/sys/net/ipv6/conf/tun0/forwarding
Edit
vi /etc/openvpn/server.conf
Tambahkan
server-ipv6 2345::/64 push tun-ipv6 ifconfig-ipv6 2345::1 2345::2 push "route-ipv6 2000::/3"
Restart
/etc/init.d/openvpn restart
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 client.ovpn
Akan keluar kira-kira
.. .. Sat Feb 16 08:24:44 2019 Unrecognized option or missing or extra parameter(s) in client.ovpn:14: block- 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 yang ada IPv6-nya
ifconfig
tun0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST> mtu 1500
inet 10.8.0.3 netmask 255.255.255.0 destination 10.8.0.3
inet6 2001:db8:0:123::1001 prefixlen 64 scopeid 0x0<global>
inet6 fe80::36a5:3f7a:13b1:a4d5 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 3861 bytes 4970868 (4.9 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 2835 bytes 215402 (215.4 KB)
TX errors 0 dropped 543 overruns 0 carrier 0 collisions 0
Cek tabel routing, jika bermasalah perbaiki, misalnya,
ip route show ip route del ::/0 ip route del ::/0 ip route del ::/0 ip route add ::/0 dev tun0
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