Technical Tip: SD-WAN performance SLA down because of DNS issue

[tino_p]

Description	This article describes the issue of SDWAN performance SLA being down due to DNS problems. This can happen especially when using Ping (to a domain name) as the protocol in Performance SLA. For example:   In the Firewall's CLI, it also cannot ping to domain name: google.com. It usually indicates that the Firewall has an issue with DNS settings.
Scope	SD-WAN, FortiGate, DNS.
Solution	To fix the problem, it is possible to either: Create a new Performance SLA - ping protocol, using the IP address instead of the domain name, and apply it in the SD-WAN rule.   Or, To fix the DNS issue on the Firewall, so that the Firewall can resolve the domain name to the IP address.