System and Network configuration • openvpn works on android and pc(lmde7) not on laptop(mintxfce22.3)

I have a synology nas with vpnserver installed. I created a config file VPNThuis.ovpn which I copied to my android phone, to lmde7 in a virtual machine and to mint xfce 22.3 on a laptop.

test result:

• android: openvpn app: my ip changes after starting the vpn to the IPv4 adres. OK!
• LMDE7: my ip changes after starting the vpn to the IPv4 adres. OK! Here is the command with the output

  Code:

   sudo openvpn --config '/home/peer/vpn/VPNThuis.ovpn' [sudo] password for peer:         
  2026-01-18 15:06:33 WARNING: Compression for receiving enabled. Compression has been used in the past to break encryption. Sent packets are not compressed unless "allow-compression yes" is also set.2026-01-18 15:06:33 DEPRECATED OPTION: --cipher set to 'AES-256-CBC' but missing in --data-ciphers (AES-256-GCM:AES-128-GCM:CHACHA20-POLY1305). OpenVPN ignores --cipher for cipher negotiations. 2026-01-18 15:06:33 OpenVPN 2.6.14 x86_64-pc-linux-gnu [SSL (OpenSSL)] [LZO] [LZ4] [EPOLL] [PKCS11] [MH/PKTINFO] [AEAD] [DCO]2026-01-18 15:06:33 library versions: OpenSSL 3.5.4 30 Sep 2025, LZO 2.102026-01-18 15:06:33 DCO version: N/AEnter Auth Username: peervpnEnter Auth Password: ••••••••                
  2026-01-18 15:06:42 WARNING: No server certificate verification method has been enabled.  See http://openvpn.net/howto.html#mitm for more info.2026-01-18 15:06:43 TCP/UDP: Preserving recently used remote address: [AF_INET]<MY_IP4>2026-01-18 15:06:43 UDPv4 link local: (not bound)2026-01-18 15:06:43 UDPv4 link remote: [AF_INET]<MY_IP4>2026-01-18 15:06:43 WARNING: this configuration may cache passwords in memory -- use the auth-nocache option to prevent this2026-01-18 15:06:44 [peervpn.synology.me] Peer Connection Initiated with [AF_INET]<MY_IP4>2026-01-18 15:06:44 TUN/TAP device tun0 opened2026-01-18 15:06:44 net_iface_mtu_set: mtu 1500 for tun02026-01-18 15:06:44 net_iface_up: set tun0 up2026-01-18 15:06:44 net_addr_ptp_v4_add: 10.8.0.6 peer 10.8.0.5 dev tun02026-01-18 15:06:44 Initialization Sequence Completed

• mint xfce 22.3: my ip does not change after starting the vpn to the IPv4 adres but is the same a before starting the vpn. NOT OK! Here is the output.

  Code:

  sudo openvpn --config /home/peer/vpn/VPNThuis.ovpn[sudo] password for peer:         
  2026-01-18 15:02:39 WARNING: Compression for receiving enabled. Compression has been used in the past to break encryption. Sent packets are not compressed unless "allow-compression yes" is also set.2026-01-18 15:02:39 DEPRECATED OPTION: --cipher set to 'AES-256-CBC' but missing in --data-ciphers (AES-256-GCM:AES-128-GCM:CHACHA20-POLY1305). OpenVPN ignores --cipher for cipher negotiations. 2026-01-18 15:02:39 OpenVPN 2.6.14 x86_64-pc-linux-gnu [SSL (OpenSSL)] [LZO] [LZ4] [EPOLL] [PKCS11] [MH/PKTINFO] [AEAD] [DCO]2026-01-18 15:02:39 library versions: OpenSSL 3.0.13 30 Jan 2024, LZO 2.102026-01-18 15:02:39 DCO version: N/AEnter Auth Username: peervpnEnter Auth Password: ••••••••                
  2026-01-18 15:02:49 WARNING: No server certificate verification method has been enabled.  See http://openvpn.net/howto.html#mitm for more info.2026-01-18 15:02:51 TCP/UDP: Preserving recently used remote address: [AF_INET6]<MY_IP6>2026-01-18 15:02:51 UDPv6 link local: (not bound)2026-01-18 15:02:51 UDPv6 link remote: [AF_INET6]<MY_IP6>2026-01-18 15:02:51 WARNING: this configuration may cache passwords in memory -- use the auth-nocache option to prevent this2026-01-18 15:02:52 [peervpn.synology.me] Peer Connection Initiated with [AF_INET6]<MY_IP6>2026-01-18 15:02:52 TUN/TAP device tun0 opened2026-01-18 15:02:52 net_iface_mtu_set: mtu 1500 for tun02026-01-18 15:02:52 net_iface_up: set tun0 up2026-01-18 15:02:52 net_addr_ptp_v4_add: 10.8.0.6 peer 10.8.0.5 dev tun02026-01-18 15:02:52 Initialization Sequence Completed

  I replaced the IP-adresses with port with <MY_IP4> and <MY_IP6>
  The only difference I see is the IP-adress. LMDE7 uses IPv4 and mint xfce22.3 uses IPv6.
  I think this is the problem. Can this be so?? How do I solve this?

Statistics: Posted by peer — 2026-01-18 14:40