Connectivity Check Settings
The settings for connectivity check may be adjusted on the Advanced tab of the Exinda SD-WANSoftware-Defined Wide Area Network Management Interface. These settings determine how the Exinda SD-WANWide Area Network discovers and monitors the connectivity of the individual WAN interfaces.
The Exinda SD-WAN attempts to reach external servers to determine if a WAN interface is successfully connected. The connectivity check proceeds in three phases:
- Resolving connectivity check addresses
- Pinging connectivity check addresses
- Simultaneously pinging and attempting HTTP connections to connectivity check addresses
The maximum duration (in seconds) of each phase may be adjusted by clicking Settings in the Index column of the Connectivity Check Settings configuration table. If desired, to immediately check HTTP in addition to ICMPInternet Control Message Protocol, the time for the ping phase may be reduced to zero. Be aware, though, of the bandwidth overhead of retrieving HTTP responses on very limited lines.
The Exinda SD-WAN internally manages a list of active server IPs that is used for these checks, which are automatically updated as long as the Exinda SD-WAN maintains a connection to the internet. Additional servers may be added manually by clicking Add next to Additional Remote Servers for Connectivity Check on the Advanced tab and entering the server’s IPInternet protocol address. These servers should be responsive to ICMP or HTTP requests, or both, and be available with high reliability.