High availability
ê For older devices without support, this function requires the licensing of the High Availability module.
i The options for this function can be found in the web interface under Configuration - High availability.
1. Configure the high availability
- 
                                                Before you start configuring the high availability, you must either configure both gateways with a static IP address or set your DHCP service so that both gateways always have the same IP address. The static IP address can be found under "Configuration -> Network". IMPORTANT NOTE: Both gateways must be in the same network (VLAN). 
- Activate the high availability and select a mode. Ensure that the same mode is activated for both devices.
- Assign a virtual IP address from the network of the two SMS Gateways. The web interface will be available under this IP address.
- Enter an SHA1 coded character string as secret. - The secret is an alphanumeric string to identify cluster nodes to each other, the secret have to be 40 characters long
 
- Enter the IP address of the other SMS Gateway.
- Enter the hostname of the other SMS Gateway.
- Save your settings.
- Restart both SMS Gateways.
2. Example configuration
2.1. Primary SMS Gateway (Master Node)
                                             
                                        
2.2. Backup SMS Gateway (Slave Node)
                                             
                                        
ê For older devices without support, both SMS Gateways require identically licensed modules so that the primary SMS Gateway can be fully replaced in the case of a failure.
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