WAN Health Check

Regarding the WAN Health Check, what are the pro and cons between using ping vs DNS lookup?

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The default DNS Lookup works just fine 90% of the time but I always recommend to not use the auto-assigned DNS servers from the ISP and instead use Google’s public DNS servers and Extremely reliable whereas some ISP DNS servers can be flaky leading to failed health checks.

The other health check mechanisms are there for the other 10% of the time. An example would be if you forgot to pay your bill and the ISP blocks your web traffic but still allows DNS traffic to pass.