> Moreover, the DNS failure might not come from the DNS server, but a misconfigured computer/router/DHCP server, etc. And it depends a lot on your DNS server it

> Moreover, the DNS failure might not come from the DNS server, but a misconfigured computer/router/DHCP server, etc. And it depends a lot on your DNS server itself. It is a single point (chain, if you want) of failure, and tends to fail quite often, in my experience. Misconfigured networking is going to make networking fail anyway. DNS is an amazingly resilient system since it has had decades to mature.