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- tunnel any IP subnetwork or virtual ethernet adapter over a single UDP or TCP port,
- configure a scalable, load-balanced VPN server farm using one or more machines which that can handle thousands of dynamic connections from incoming VPN clients,
- use all of the encryption, authentication, and certification features of the OpenSSL library to protect your private network traffic as it transits the internet,
- use any cipher, key size, or HMAC digest (for datagram integrity checking) supported by the OpenSSL library,
- choose between static-key based conventional encryption or certificate-based public-key encryption,
- use static, pre-shared keys or TLS-based dynamic key exchange,
- use real-time adaptive link compression and traffic-shaping to manage link bandwidth utilization,
- tunnel networks whose public endpoints are dynamic such as DHCP or dial-in clients,
- tunnel networks through connection-oriented stateful firewalls without having to use explicit firewall rules,
- tunnel networks over NAT,
- create secure ethernet bridges using virtual tap devices, and
- control OpenVPN using a GUI on Windows or Mac OS X.
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By default, all Vutlan monitoring systems use LAN as a primary access point. If LAN becomes unavailable, the monitoring system will switch to a secondary LTE connection using "VT760 / LTE modem", if installed. Network availability via LAN is determined by ping specified addresses, read more at LTE modem mode.
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If OpenVPN is not enabled and there's a switch between LAN and LTE connection, the SNMP software may lose the system, because LAN and LTE can have different IP addresses.
Solution:
By Enabling OpenVPN we can create a secure site-to-site setup, where two (or more) different networks are connected
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using one OpenVPN tunnel. See the picture below. In this connection model, devices in one network can reach devices in the other network, and vice versa. OpenVPN Access server routes SNMP software or the operator directly to the Vutlan monitoring system allowing SNMP software to constantly stay connected to the Vutlan monitoring device.
Configuration
Since version 2.7.4, you can use the OpenVPN client to access a private network. Client settings are in the "Preferences" menu, in the "VPN client" tab.
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OpenVPN is not able to independently monitor the connection status, that is why you can use Watchdog Ping to verify the connection. When specifying an address for testing the connection, use the address of the resource within the VPN, usually the address of the server. When setting a timeout, it is recommended that it be at least 3 times longer than the ping period. If , during the timeout period, no successful ping passes to the specified address, the connection is considered to be broken and the client will attempt to establish a new connection to the VPN server.
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