Reconfigure VPN

DFNEXT systems

These instructions are for system DFNEXT099, please replace with a corresponding number for your camera system.

Login to the camera system...

...either locally using ethernet wire or WiFi or just use screen and keyboard (HDMI, screen needs to be connected before powering up the camera box).

Disable and remove the old VPN config

 cd /etc/openvpn

 systemctl stop openvpn@DFNEXT099.service
 systemctl disable openvpn@DFNEXT099.service
 systemctl mask openvpn@DFNEXT099.service

 rm -rf DFNEXT099.conf DFNEXT099.tgz keys

Unzip the configuration, password protected for security reasons

Note: the password (hint) will arrive in a separate e-mail message, not with the VPN config file.

 cd /etc/openvpn

 unzip DFNEXT099.zip

... that creates file DFNEXT099.tar.gz

Install and activate the new config - on the camera system as root connected using local IP

 root@DFNEXT099:/etc/openvpn# tar -xvzf DFNEXT099.tar.gz
 client/DFNEXT099.conf
 client/keys-gfo/
 client/keys-gfo/DFNEXT099.crt
 client/keys-gfo/ca.crt
 client/keys-gfo/ta.key
 client/keys-gfo/DFNEXT099.key

 systemctl start openvpn-client@DFNEXT099.service

 systemctl enable openvpn-client@DFNEXT099.service

Verify that it is running

 root@DFNEXT099:/etc/openvpn# systemctl status openvpn-client@DFNEXT099.service
 ● openvpn-client@DFNEXT099.service - OpenVPN tunnel for DFNEXT099
   Loaded: loaded (/lib/systemd/system/openvpn-client@.service; enabled; vendor preset: enabled)
   Active: active (running) since Sun 2023-01-29 03:11:35 MST; 2 weeks 3 days ago
   Docs: man:openvpn(8)
         https://community.openvpn.net/openvpn/wiki/Openvpn24ManPage
         https://community.openvpn.net/openvpn/wiki/HOWTO
 Main PID: 15223 (openvpn)
   Status: "Initialization Sequence Completed"
   CGroup: /system.slice/system-openvpn\x2dclient.slice/openvpn-client@DFNEXT099.service
           └─15223 /usr/sbin/openvpn --suppress-timestamps --nobind --config DFNEXT099.conf

 root@DFNEXT099:/etc/openvpn# ip a | grep tun
 15: tun0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN group default qlen 100
    inet 10.1.23.99/20 brd 10.1.31.255 scope global tun0

 root@DFNEXT099:/etc/openvpn# ping -c 3 dfn_vpn
 PING dfnserver_vpn (10.1.16.1) 56(84) bytes of data.
 64 bytes from dfnserver_vpn (10.1.16.1): icmp_seq=1 ttl=64 time=213 ms
 64 bytes from dfnserver_vpn (10.1.16.1): icmp_seq=2 ttl=64 time=211 ms
 64 bytes from dfnserver_vpn (10.1.16.1): icmp_seq=3 ttl=64 time=220 ms
 
 --- dfnserver_vpn ping statistics ---
 3 packets transmitted, 3 received, 0% packet loss, time 2002ms
 rtt min/avg/max/mdev = 211.841/215.206/220.417/3.755 ms

DFNKIT & DFNSMALL systems

Note: this is an example for DFNKIT22. Replace the hostname according to the system you are working on.

Remove the old config file and keys/certificates

(and also the old config tarbal *.tgz)

 DFNKIT22 ~ # cd /etc/openvpn
 DFNKIT22 openvpn # rm -rf DFNKIT22.conf DFNKIT22.tgz keys

Note: If not sure what to delete, the old certs can stay and the .conf file actually gets overwritten when unwrapping the tar.gz. However, there is no use for the old keys/certificate, as that is expired.

Then unwrap the new config into /etc/openvpn

(still in folder /etc/openvpn)

 DFNKIT22 openvpn # tar -xvzf DFNKIT22.tar.gz

That creates new .conf and certs in keys-gfo subfolder.

Then restart the openvpn client service

 DFNKIT22 openvpn # service openvpn restart

Verify that it is running

 DFNKIT22 ~ # service openvpn status
 [ ok ] VPN 'DFNKIT22' is running.

 DFNKIT22 openvpn #  ip a | grep tun
 4: tun0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 100
     inet 10.1.21.22/20 brd 10.1.31.255 scope global tun0

 DFNKIT22 openvpn # ping -c 3 dfn_vpn
 PING dfnserver_vpn (10.1.16.1) 56(84) bytes of data.
 64 bytes from dfnserver_vpn (10.1.16.1): icmp_req=1 ttl=64 time=234 ms
 64 bytes from dfnserver_vpn (10.1.16.1): icmp_req=2 ttl=64 time=234 ms
 64 bytes from dfnserver_vpn (10.1.16.1): icmp_req=3 ttl=64 time=233 ms

 --- dfnserver_vpn ping statistics ---
 3 packets transmitted, 3 received, 0% packet loss, time 2003ms
 rtt min/avg/max/mdev = 233.998/234.104/234.203/0.083 ms