Using VPS hosting and dynadot (domain registrar) DNS. Checked domain name with http://www.intodns.com and get some warnings
Different subnets WARNING: Not all of your nameservers are in different subnets
Different autonomous systems WARNING: Single point of failure
As understand to avoid the warning must have second Ip4 address and both the addresses must point to different servers? If both Ip addresses point to the same server, it does not help?
I mean each server has own Ip address. If one server down, then visitors can access website (files) on another server? Is this the reason why need more than one Ip?
Tried to point website to 2 ip addresses and after some time get warning from uptimerobot